In case you're not keen on what Stylish does, it allows you to add your own CSS style elements to any web page in much the same way that Greasemonkey lets users add their own Javascript to a web page.
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CSS Pseudo-elements Explained in 100 Seconds
CSS Pseudo-elements in 100 Seconds Dive into the world of CSS pseudo-elements! Learn how to use ::before and ::after to add stylistic content without altering your HTML. Perfect for adding icons, ...
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