You could try using a percentage for the width instead of a number. That way, it'll stretch to be a percentage of the screen size (or whatever container it's in) instead of the same amount of pixels on every screen. By the way, you can use this site http://whatismyscreenresolution.net/multi-screen-test to test how your site looks on various screen sizes. It's a little outdated and a lot of the screen sizes aren't... Source: over 2 years ago

Stylus is a browser extension that allows you to apply custom CSS to any website. Https://add0n.com/stylus.html. - Source: dev.to / 5 days ago

Both of these are hosted on userstyles.world. To use them, you'll need to have a browser extension like Stylus . Then just click the blue Install button for each tool you want! Source: almost 1 year ago

These are both hosted on userstyles.world. I recommend using them with the Stylus browser extension, which works on Chrome, Firefox (including Firefox Nightly for Android) and Opera. (Pretty sure it will also work with Cascadea if you're on Safari but I haven't tested it yet.). Source: about 1 year ago

I wonder if Stylus would be good for this... Source: about 1 year ago

If you don't have a userstyles extension installed, you can get one here for Firefox or Chrome, but for Safari you'll have to do some tweaking. Source: about 1 year ago