To make changes, find the tweak you want to edit inside of [`mktweaks.user.css`](mk-tweaks.user.css), which uses the [Stylus preprocessor](https://stylus-lang.com/). Don't edit anything else outside of the if statements. Please only change one tweak at a time when making a pull request.
If you want, you can then copy & paste the code into https://stylus-lang.com/try.html, and paste the output into the corresponding `.css` file inside of the tweaks folder.