One of my favorite aspects of Sass is how easy the functions make it to work with colors. When I’ve studied color as a designer I learned color in HSL. When I’ve worked with color in CSS, it’s been either hexadecimal or rgb(a) values. The color functions in Sass helped me to bridge the gap between the different notations.
It’s been a few years since I started working with Sass and while there are a lot of reasons why I continue to use it, the built-in color functions are easily among my favorite features of the language. You can use them to mix two colors or lighten or darken another color. You can even use them to build complex color schemes from a single color.