Edit responsive wordpress theme

I have a responsive wordpress theme, the problem is I use an advertisement widget that is not responsive and the width is too large on mobile devices

I need an edit to continue displaying the advertisement as is, up to a certain width, and display different ad code if the theme is shown on a mobile device/low resolution device

example: (warning, adult site - slutleech dot com click on any of the posts and scroll down to see the advertisement, looks fine on desktop, is too wide on mobile)

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