Originally posted on WordPress.com News:
CSS (Cascading Style Sheets) is a handy tool to separate the presentation from the content of your website — you write the content, and the CSS controls the look and formatting. CSS is great for giving your website a custom look, but it can also become complicated to maintain.
The solution to this? CSS preprocessors.
(If you’re new to CSS, you might want to stop here and check out some CSS basics. If you’re already knee-deep in selectors, read on to learn how CSS preprocessors can streamline your styling.)