If you are a web developer who is comfortable with standard CSS and want to take your development to the next level, then I thoroughly recommend SASS.

With SASS, you have several new features that can be applied to your code, such as: nesting elements to match your styling code more closely to that of your HTML markup. Another great feature is the ability to use variables, which enable the code to be reused through your stylesheet, such as colour hex codes.
https://sass-lang.com/

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