The visual style that has become standard in IDEs β Jetbrains, XCode, VSCode β is an abomination. This paper by on editor aesthetics is framed in the context of #emacs, but you should read it even if you use a different environment.
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I prefer the video presentation to the paper in this case, but sadly β in typical GNU style β they've chosen to avoid the obvious video-sharing platforms in favor of poor viewer UX:
emacsconf.org/2021/talks/des
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And the repository seems to be here: github.com/rougier/elegan - interesting explorations! Not sure I agree with everything, but I love the use of contrast, colour and typography.

