Looking out for a high CSS javascript developer

Hi, I work on a project webpage for smartphones. (Android and IOS) In a form I use "[login to view URL]" [login to view URL] When I use this on a smartphone and I choose a color (scrolling over colourspace) the whole page is scrolling also. I want to avoid this. I's not user friendly. I trie also a lot things and using viewport is not a solution. I think that the popup colorpicker must be vertical and horizontal popups with position:absolute over the whole page. At this way the colorpicker not scrolling the whole page. I gess. Conditions to work: I don't allow FTP access. Work only remote via AnyDesk, Skype, Teamviewer. I prefer Anydesk. Causion: I work on big screen. If you work with a laptop the rendering will be to small on your side. There is no example URL because it's protected by user password. Ofcourse I give you a account so you can check your results on your Iphone AND Android. Yes you need booth. As I'm very familiar working with freelancers I looking out for a outstanding Freelancer. I have bad experience with trie & error. I want to hire a freelancer where i win time and not loose time. Are you good in javascript and CSS. Chat me! Thanks in advance.