In this post, I’m going to show you how I wrote a 4-thousand-lines CSS framework in less than 2 working days. This framework is based on Bootstrap which is a CSS framework. It also has the 5 breakpoints used by this famous framework for responsiveness. With less than 75 lines we were able to create 72 classes equivalent to 378 lines of code. We followed Bootstrap and kept the 12 column grid grid, but you can create more or less. Preprocessors are used to generate CSS code and make the web page layering enjoyable.