LED Spot Light Develop (Hardware and IoT Software) 조명개발자 (하드웨어, 소프트웨어) Select COB LED, High CRI, CCT, .. etc 등의 LED 모듈 개발, 선정, 고연색성 전시조명 개발 Well understood about LED 에 대한 이해, COB, SMT, 빛에 대한 이해 Experenced 개발및 제조경험자
기존 스마트폰 APP에 대해서 업그레이드를 위한 단기 프로젝트입니다. 현재 1차 버전은 안드로이드와 iOS APP 으로 BLE 제품과 연동하고 있으며 2차 버전에 대한 디자인은 완료되어 있음. 중점적으로 2차 버전의 User interface 에 대해서 구성하는 것이 핵심적인 내용이 될 듯 함.
...making early adopters and investors incredibly wealthy in the process. Its decentralized nature and limited supply (capped at 21 million coins) have contributed to its status as a digital gold and a hedge against inflation and economic instability. Challenges and Criticisms Despite its widespread popularity, Bitcoin faces several challenges and criticisms. Its volatility and speculative nature have led to concerns about its suitability as a medium of exchange and store of value. Moreover, its decentralized nature has made it a target for regulatory scrutiny and government intervention, with some countries imposing restrictions or outright bans on its use. Additionally, the energy-intensive process of mining Bitcoin has raised environmental concerns, prompting calls for more sust...
I need an experienced Wordpress website designer who can work precisely on three aspects: 1. Onsite SEO Optimization...thoroughly secure to protect both admin and users. Additionally, I plan to expand the range on my site by including digital products. So, I need the designer to arrange these products on the site in an appealing way. Experience in developing online stores would be appreciated. Lastly, I need content (both text and media files) from another website to be moved to the new site. It's crucial that the layout and formatting remain consistent during the move. In summary, you need to be proficient in Wordpress, SEO, security enhancement, and preferably have experience with digital product presentation and content migration. I look forward to working with you o...
I'm in need of a detail-oriented architectural drafter to create a comprehensive 2D construction plan for a Marathi temple, measuring 17 m by 30 m, using AutoCAD. Your responsibilities will encompass: - Developing an intricate architectural layout that contains a floor plan, elevations, and sections. Extra attention to detail to accurately capture the unique design elements of a traditional Marathi temple is crucial. - Incorporating electrical and plumbing layouts into the construction plan. Ideally, you should have: - Extensive experience with AutoCAD in creating detailed construction plans. - Proficiency in architectural layouts, especially temples or similar cultural structures. - Strong understanding of electrical and plumbing elements in architectural design. Your ...
I'm in need of an experienced architect or house designer to create a modern house design and floor plan. The house will be of medium size, between 1,000 - 2,000 square feet and should include 3-4 bedrooms. Your main tasks will include: - Designing and drafting a modern house that fits the given size range - Including 3-4 bedrooms in the floor plan - Making sure the design and layout of the house is family-friendly and functional - Suggesting and incorporating modern architectural features - Providing a complete set of drawings for the house design, including elevations, sections, and floor plans Ideal skills and experience for this job: - Proven experience in designing modern houses - Proficiency in architectural design software like AutoCAD, SketchUp, or similar - Creative...
I'm seeking an experienced interior architect with a keen eye for modern design to handle a project focused on Indian Textile Retail shops. Key Responsibilities: - Execute a modern commercial interior design plan that captivates the eye while maintaining functionality - Areas of design focus should include the layout and overall aesthetic of the shop Skills & Experience: - Proven experience in modern commercial design, particularly targeting shops - Strong creativity and imagination - Attention to detail - A flair for color, fabric, and space planning - Ability to translate design concepts into tangible plans Your bid should demonstrate your understanding and experience with modern commercial design. Share examples of your past work, specifically commercial designs fo...
I am in need of an experienced PCB designer who can create a small PCB module with the following features: - ESP32 - SIM module - Gyro - Battery backup with charging port Ideal skills and experience for this job include: - Extensive experience with ESP32 and SIM modules - Proficiency in PCB design software - Knowledge of battery technologies suitable for motorbike use - Understanding of gyro and sensor interfacing - Ability to design a compact PCB (less than 5cm x 5cm) Please provide samples of your past PCB designs in your bid.
I'm looking for an email marketer with a knack for clear, professional design. The purpose of my campaign is to drive awareness of my products and services amongst a B2B contacts list. Your expertise will enhance communication with potential clients in a professional and clean layout. Key Requirements: • Develop a professional and clean email template. • Creatively promote our products/services specifically catered to B2B contacts. • Experience in B2B email marketing highly preferred. • Proven ability to deliver an effective email marketing strategy. Excited to work together and build a campaign that will propel my services to new heights!
I'm seekin...job title, company logo, and contact details in an eye-catching and professional manner. - Include my social media handles and website to encourage further engagement with my brand. - Design should strike a balance between being visually appealing and maintaining a professional appearance. Ideal skills for this project: - Proficiency in graphic design software to create a polished and attractive layout. - Experience in designing business cards that effectively communicate key information to clients and partners. - Creativity to suggest and implement design elements that enhance the overall impact of the cards. I'm looking for a designer who can deliver a high-quality, comprehensive business card design that helps me make a positive impression on potential c...
I have a Canva design, a domain, and hosting in place. I need an experienced WordPress professional to bring this design to life on my website with some key updates: - Apply Layout Modifications: I need the design layout reconfigured to better suit my vision. With expert knowledge of WordPress's customization options, you can tweak the layout to make it more engaging and fitting for my brand. - Content Updates: The project involves adding or removing certain sections on the website as per requirement. You should have an eye for detail to ensure these changes do not affect the overall harmony of the design. Your experience in translating designs to WordPress websites will be key to the success of this project. You should also be comfortable in guiding me to main...
...projector to expose a photosensitive-coated target with UV light. This projector must have an adjustable image output that varies from 0.1 reduction [image source to target image] down to about 0.02 reduction. At all image reduction settings, the focus must be adjustable. The input image will vary from about 5mm to 1mm, and the output image will be from 1.5mm to 0.25mm. The light source will be LED, outputting 50 watts of mid-UV light. The output of this gig shall be a drawing/sketch of the relative positions of each optical element in relation to the light source [UV light], the source image/film, and the target. For each optical element, there shall be a full description/specification, and if possible, at least one source to buy the element. I do not need any mechanical desig...
I'm in need of an exceptional developer with expertise in Flutterflow, chatbot creation and medical database management to create a unique cross-platform application. This app will enable users to book doctors' appointm...diagnosis capabilities Idea Skill Set: - Experience in Flutterflow and cross-platform mobile app development - Expertise in UI/UX design, preferably in healthcare sector - Strong understanding of chatbot algorithm - Familiarity with medical databases. This project requires thoughtful dialogue design considering the chatbot's basic diagnostic capabilities. Creative input for application design and layout is also welcomed and needed. I look forward to working with someone passionate about healthcare and tech who can deliver an intuitive, helpful a...
I'm looking for a talented graphic designer who can create an engaging and professional layout for a Vehicle Inspection Report. The purpose of this report is to inform potential buyers about the vehicle's condition, specifications and inspection details. Our company is Autoguru Ireland and we conduct the vehicle inspections on behalf of an auction house called Merlin Car Auctions. Key Points: - The report will include detailed vehicle specifications - An inspection checklist for prospective buyers - A thorough condition report - Be on brand I envision a 2 or 3 page PDF report that's easy-to-read and visually appealing and aligns with the branding of Merlin Car Auctions. The design should be clean, clear and organized, ensuring potential buyers can quickly and easil...
...business audience. Redesign website to reflect our commercial services of Facilities Maintenance, Signage and Lighting. Create more of a simplified feel (somewhere between Mom & Pop and large group, want to feel like a less expensive option and hometown.) Would like page to be dynamic, if possible, to morph to the city of the searcher. I would like specific landing pages to target the market of LED parking lot lights and Sign work, later I would like to add our facilities arm of Plumbing, Electric, General, HVAC. I would further like to be number 1 for searches in the state of Florida for commercial signage, Parking lot lighting and Facilities Maintenance. I don’t know if this is initially achieved through paid search coupled with SEO and SERPs (this is by far not m...
I'm seeking a professional to critically review and improve upon the detailing of product specifications on my Shopify store. As someone looking to offer my customers supreme transparency, I want the product details to be more precise and comprehensi...this assignment. You should: - Be able to review Shopify product descriptions - Have expertise in e-commerce product listing and detailing - Possess customer perspective understanding for online product descriptions The ultimate goal is to create a better shopping experience for my customers by providing clear and detailed product specifications in my Shopify store. Importantly, no design, layout, payment options, or checkout process related changes are needed. The project is strictly about enhancing product descriptions and ...
I'm in need of an experienced Kajabi expert to revamp my website. My site is going through a complete rebranding, and I'm looking to achieve a modern and minimalist aesthetic with the redesign. To achieve this, I need help with the following: - **Layout:** I'm looking for a fresh and functional layout that aligns with the principles of modern design. This should encompass an easy-to-navigate structure that encourages user engagement and promotes conversions. - **Colors:** I have a set of colors that represent my brand. Your task will be to incorporate these colors into the new design in a way that is visually appealing and harmonious. - **Typography:** A crucial element of design, typography can significantly impact the overall look and feel of the site. I...
I am looking for a competent WordPress specialist capable of modifying the CSS code to change the layout and positioning in my site's archive products section. Key tasks include: - Transforming the layout of the archive products section to a grid view. Ideal candidate should have a meticulous eye for detail and a solid understanding of CSS. Previous experience with WordPress layout adjustments is beneficial.
I'm seeking a brochure designer with a knack for creating modern and clean aesthetics. The primary purpose of this project is to develop a brochure that will promote a particular product/service, aimed at potential new customers. Key aspects of this project will include: - Aesthetically modern and clean design - Effective promotion of a product/service - A layout and messaging tailored towards potential new customers The ideal candidate should have experience in graphic design, particularly in creating brochures. Their portfolio should showcase a wealth of modern, clean designs. Experience in marketing and audience targeting is also preferred.
I'm seeking a highly-skilled social media expert to magnify our car repair exper...our car repair expertise. - *Social Media Posts*: Our main goal is to showcase our skills in restoring vehicles after accidents. We need a creative strategy to highlight our work through before-and-after pictures, focusing primarily on the stunning final look of each vehicle post-repair. - *Instagram Profile Upgrade*: Alongside the visual content creation, we hope to enhance our Instagram layout and design as part of our digital brand identity. The ideal candidate should have a knack for visual storytelling, a solid understanding of Instagram algorithms, aesthetics, and expertise in creating compelling layouts. Previous experience in the automotive industry or similar projects will be gre...
I need someone to make illustrations for a children's book. I only have the text for the book and need help with the layout and all illustrations. Its a couple of short stories, and hopefully the project will be expand.
...Showcasing the paths and management of electrical conduits and other containment systems. All containment will be mounted on suspended Unistrut brackets, with a minimum of 800mm of space above the false ceiling. Single Line Schematic: A detailed schematic for the main distribution board, illustrating the arrangement and connections of switches, fuses, circuit breakers, and other electrical components. Layout Drawings: These will include separate sheets for: Fire Alarm System: Displaying all devices and their connections throughout the building. General Services & Power: Illustrating the placement and routing of general electrical power supplies and outlets. Mechanical Services: Detailing the electrical connections and components related to mechanical installations such as H...
I'm looking for an expert with experience in designing and rendering architectural drawings for secondary homes. The home should be between 500 and 1000 square feet. Essential features include separate living area and bedroom. Ideal freelancer would have: - Extensive experience in architectural design and drafting. - Knowledge of small home design. - Ability to adhere to specific space and layout requirements. - Portfolio demonstrating similar projects. Deliverables should include comprehensive drawings detailing all aspects of the home, geared towards ease of construction. A model or 3D rendering would be a huge plus.
I'm currently facing an issue with high CPU usage affecting my server. This has led to a significant slowdown in my website's performance and I am needing an experienced Laravel developer to assist in resolving this. Key responsibilities will include: - Diagnosing the root of the high CPU usage - Implementing improvements to rectify the issue Regarding server load, I've not been able to identify the precise figures. This project does not involve working with any established caching mechanisms as none are currently being used. Essential skills and experience: - Proficiency in Laravel - In-depth understanding of server operations and CPU usage - Proven record of successful server optimizations - Familiarity with CyberPanel and OpenLiteSpeed would be benefic...
I'm looking for a skilled designer who can work in both Canva and PowerPoint. The project involves creating a range of designs for vari...creating a range of designs for various audiences and purposes. Key Requirements: - Proficiency in Canva and PowerPoint - Experience in creating engaging Social Media Graphics, Presentations, and Marketing Materials - Must be able to tailor designs to suit a variety of audiences including Business Professionals, Students, and Creative Professionals Ideal Skills: - Expertise in graphic design and layout - Understanding of different design types across social media, marketing, and presentations - Ability to adapt a design to suit various target audiences - Excellent communication and collaboration skills Looking forward to your creative inp...
I need an expert in Arduino programming to develop a code that connects to an OV7670 camera, recognizes specific patterns (like a person's head) and triggers an LED. Key Requirements: - Use an Arduino Uno or Nano to interface with an OV7670 camera and LED. - The code should have a pattern recognition feature - specifically, recognizing a person's head. - When the pattern is detected, the LED should light up to indicate an event has occurred. Additional Details: - The code should be able to differentiate a specific pattern (a person's head) from other objects or patterns that may be in the camera's view. - This is an intermediate level project, hence the recognition should be accurate enough to detect the specific object. Ideal Skills: - Proficien...
I'm looking for someone experienced in creating efficient customer-facing forms, specifically agreement forms. I need a form that not only looks professional and is easy to understand, but also effectively collects data from our customers. Ideal skills: - Experience in form design and layout - Knowledge of data collection best practices This form will primarily serve as a data collection tool for our customers, so it's essential that the design encourages completion and accurate responses. Previous experience in crafting similar forms will be highly regarded.
I'm in need of a professional brochure designer to create a 13 to 16-page landscape layout. - Design: I'm looking for a professional design, with a clean and corporate feel. Please ensure that the design aligns with the goals of introducing our company. - Color Scheme: I have a preference for turquoise blue as the primary color of the brochure, so please make sure to incorporate this in the design. Logo and content are attached.
I need the some texts translated from German to US English as soon as possible. Need high quality human translation only. Google/AI or automatic software works are not allowed and will be rejected. Need the translation back in word document format maintaining the layout of the source file. Deadline: 48 Hours.
I am enthusiastic about relaunching my website's design with a strong focus on aesthetics and user experience with the ultimate aim of increasing sales conversions. I am interested in a complete modern makeover, including: - Overhauling the overall layout and structure - Refreshing the color scheme and typography - Enhancing imagery and graphics I believe these changes can steer my online storefront to be more appealing, engaging, and easy to navigate, therefore enticing potential customers to make a purchase. I am currently hosted on Woocommerce (WordPress) but am open to a migration to Shopify if you think it'll serve my business better. Ideal skills for the job would include: - Proven experience in website design and redesign - Proficiency in Woocommerce (WordPres...
Research Assistant for a Research Project Project Duration: [ 3 months] Overview: We are seeking a highly skilled and motivated Research Assistant to support a significant research project led by a University. The ideal candidate will possess a strong background in financial databases, data analysis, and academic research, with proven expertise in using Stata for data organization and analysis. Responsibilities: Download and extract data from financial databases and annual reports as well as others as required. Efficiently merge and manage datasets from multiple sources to ensure consistency and accuracy. Conduct thorough literature reviews in finance and related fields to support research objectives. Utilize Stata to analyze complex datasets, perform econometric modeling, and g...
I am looking for an interior designer to transform my boutique's interior into a contemporary, modern work of art. The design should incorporate: - A modern aesthetic: We have chosen a modern theme for the boutique. - Traditional furniture: Despite the modern layout, we anticipate traditional furniture will provide a unique contrast to the design. - Neutral color scheme: We want neutral tones like beige, gray, white etc, to dominate the color landscape of the boutique. The ideal freelancer should have a portfolio of past experiences with modern design themes, should know how to incorporate traditional furniture into the layout's aesthetic, and have mastery over neutral color schemes. Knowledge of spatial arrangement and how to use it to maximize a boutique's appeal...
I am seeking an experienced Architect or draftsman to develop a 2D playground specifically targeted for children. Ideal Skills: - Experience with creating kids' games. - Understands child psychology and gaming trends. - Proven experience in 2D design. The key features or activities to be included were not specified, so feel free to be creative and suggest some based on your experience and understanding of what might work best in a children's game. However, it would be great if the game includes but is not limited to popular play elements like swings, slides, and climbing structures. Please include examples of previous similar work in your proposal.
...the design. Key Details: - I will provide a mood board to guide your design process. - The color scheme and overall aesthetic will be clearly indicated in the mood board. Please Include in Your Bid: - Samples of your past work, specifically, designs on Canva would be preferred. Design Elements: - The design should be image-focused. Please incorporate high-quality, suitable images into your layout. Ideal Freelancer: - You should have experience in Canva - An ability to deliver high-quality designs that match the desired aesthetic outlined by my mood board. - Past successful engagement involving the creation of landing pages would be an ideal addition. This project is a perfect fit for someone with an eye for design, a comprehensive understanding of Canva, and the ability to...
I'm seeking expert ass...evaluation of the proposed site for feasibility and environmental considerations. Experience in multiple site assessments for hydro projects required. - Technology Selection: Guidance for identifying the most efficient and suitable hydro technology for the project. Experts with a strong background in hydro tech preferred. - Engineering Design: Well-versed in creating an optimized and robust design layout for the hydro plant. Must have a proven record in designing successful hydroelectric infrastructural plans. Expertise in hydroelectric energy and infrastructure design are a must. Knowledge in handling regulatory guidelines would be a significant advantage. Your strong communication skills will ensure precise understanding and successful execution of...
I'm in need of a WordPress expert who can help me revamp my existing website. Key Tasks: - Redesigning the layout and appearance: The current layout isn't meeting my expectations, and I believe a fresh design will enhance user experience and engagement. - Implementing new features and functionality: I'm looking to add certain features to my website to make it more interactive and user-friendly. - Improving website performance and speed: The website is currently running slow. I want to fix this issue and ensure the site is fast and responsive. - Fixing Website Errors: The website is facing some technical issues that need to be resolved. Additional Details: - The specific features and functionality I want to add are yet to be finalized. We can discuss these ...
I'm seeking a talented resume writer familiar with the technology industry, specifically based in Singapore. Main tasks: - Preparation of a resume tailored for job applications in the tech sector - Incorporation of a chronological layout to provide a carefully structured, time-ordered overview of my professional background Ideal skills: - Experience in writing Singapore-styled resumes for the technology sector - Expertise in chronological resume layouts - Knowledgeable about best practices for tech job applications - Ability to work closely with me to ensure accurate representation of my skills, qualities and experiences. I look forward to working with a professional who can help me showcase my potential to future employers.
...Troubleshooting and resolving all related performance issues While this position focuses on React Native, there might be scope to work on other parts of the app. Therefore, a broad understanding of mobile app development is preferred. To ensure clarity on your expertise, we request you to include your past work related to React Native in your application. Please showcase projects where you led or had a significant role in the React Native development phase. This will help us to gauge your expertise and project suitability more accurately. Ideal skills and experience: 1. Proven experience as a React Native developer 2. Demonstrated proficiency in programming with Javascript 3. Past work showcasing adept use of UI elements, APIs, and third-party libraries 4. Excellent...
I am searching for a dedicated WordPress developer to step in and complete my partially finished website. The task involves several tweaks, ensuring a fresh, and easy-to-navigate user experience. Roles involve: - Website Layout Adjustments: I need someone capable of rearranging elements on the site and implementing a new color scheme. The ideal freelancer should possess a keen eye for design and color coordination. - Add Additional Functionalities: Your input on how we could boost user interaction through new functionalities will be highly appreciated. Please, only individuals with proven WordPress experience and a portfolio showcasing previous design work should bid. Also, be prepared to review the current website and provide a brief strategy on your approach. The finalized ...
I have designed logo, and made an instagram account, now I need someone to prepare posts for me, and design a layout of the profile
...to record and remind us of essential maintenance activities to prevent sudden failures. The ideal candidate to execute this project should have: - Proven experience in developing inventory management systems, particularly those that have been utilized in IT settings. - Strong knowledge and skills in creating web-based systems. - A keen understanding and ability to incorporate the features and layout of gogenuity, bluetally and asset panda, or systems with similar qualities. The access to this system will be web-based for easy and immediate updates regardless of location. Please detail your approach, timeline, and the technologies you plan to use when bidding. Thank you....
I'm in search of a motion gra...accessories reseller. The graphics are intended for use in an outdoor LED wall, for brandwareness and product showcase, so visual appeal and visibility are key factors. Key Requirements: - Proficient in creating captivating 2D animations and kinetic typography. - Experience in designing content for large outdoor LED walls is highly preferred. - I will provide 3D video / png sequence for certain timeframe The project is a short one, less than 30 seconds in duration, which makes it crucial for the designer to be able to convey messages effectively in a limited time frame. If you have a strong portfolio that demonstrates your expertise in both 2D animation and kinetic typography, and ideally experience with outdoor LED wall conten...
I'm in search of a skilled and experienced web designer who specializes in blog website creation. I intend to utilize this platform primarily for sharing resources and tutorials. Key Requirements: - Develop a blog-type website - Professionally designed layout - User-friendly interface Additional Functionality: - Add functionality for user registration and login - Integrate a subscription list feature Ideal candidates would possess high proficiency in creating user-engaging web designs and have a keen understanding of incorporating specified features. Knowledge and experience in website usability and functionality are vital. The main goal is to foster a smooth user experience and promote continuous interactions.
...replaced to enable the printing of Greek uppercase characters directly. Receipt Layout Change: Update and optimize the receipt layout to accommodate Greek characters and improve overall aesthetics and functionality. Technical Requirements: Proficient in Ionic 5 and Angular. Experience with Bluetooth thermal printers and character encoding. Ability to work with both frontend and backend aspects of the application as necessary. Confidentiality: The freelancer must agree not to discuss, disclose, or distribute any information related to the app’s design, code, or business operations with any third parties. Project Deliverables: Updated application code with implemented Greek character support. Revised receipt layout that is functional and visually ap...
My project needs a skilled Amazon KDP expert who can assemble an excellent, print-ready PDF cover for my paperback book. This 5" x 8" book revolves around the theme of climate crisis recovery. The ideal freelancer for this job would: - Be intimately familiar with Amazon KDP's standards and requirements for book covers - Have a strong working knowledge of typography, layout and composition, color theory, and graphic design - Prior work with environment or climate-related content is a plus The project involves: - Incorporating provided cover photo, SVG logo, and ISBN into an engaging and professional book cover - Placing the cover texts at strategically readable locations - Ensuring the final product is compatible with the specific requirements of Amazon KDP - Deliver...
I'm in need of a skilled designer who specializes in print layout design. The task at hand involves creating an eye-catching and professional layout for a proposal. The purpose of this print material is not promotional or informational, but instead, it is for proposal submission. Key duties and skills include: - Strong background in print layout design, particularly for written proposals - Proven eye for detail, typography, and color - Knowledge of latest trends and best practices for proposal design - Ability to create a proposal that stands out while remaining professional Your task would be to take the content of the proposal and convert it into a visual masterpiece that can help sway decisions in our favor. Please provide relevant examples of past work...
I'm in need of a PowerPoint presentation that's tailored to my employees on a business-related topic. I'm looking for a skilled freelancer who can assist with the design and layout of the presentation. The ideal candidate should have a blend of design skills and a good understanding of business concepts. Key points: - Design a visually engaging and professional PowerPoint presentation - Align the content with the needs and interest of employees - Ensure the presentation is clear, concise, and engaging Experience in creating business-related content and previous work on employee-targeted material would be highly beneficial. Please provide samples of your previous work in your bid.
I'm looking for a talented developer who can revamp my UI using Tailwind CSS & HTML. There are several changes I want to make specifically on the layout. The key problem lies in my website's hero section. There are alignment issues and image sizing issues that need immediate attention. Ideally, the freelancer should be adept at: - Implementing layout changes with Tailwind CSS & HTML. - Adjusting element alignment for optimum UI/UX. - Resizing and optimizing images for better webpage performance. Your prime responsibility would be to ensure that the changes in the alignment and image size do not hamper the overall aesthetic or functionality of the website. Previous experience with UI/UX optimization is a plus.
I'm currently experiencing layout inconsistencies on the homepage of my Zid store. The elements present don't appear the way they should, creating an unsatisfactory browsing experience for visitors. The ideal freelancer for this job would: - Have extensive experience in working with Zid stores - Have an impeccable eye for design layout and consistency - Be proficient in re-arranging page elements to enhance user experience and store aesthetics The main task is to re-arrange the current elements on the homepage, creating a visually appealing and cohesive design layout. The end goal is to provide a better user experience and ensure consistent presentation across all devices and screen sizes.
