Mr.Utils
A front-end toolkit with a syntax friendly to everyone, that gives you utility classes, custom breakpoints, css variables and javascript functions.
Utilities used on Mr.Dev.’s plugins that you can also use on your own environment.
If you are using WordPress you can even install it as a plugin. You’ll get friendly options on the block editor, which allow you or your clients to use all the features without needing to know the classes or functions.