This is a document to practice tweaking a class file for the first time, using the example of setting up the possibility of changing the colour theme of the document.
The github to go with it is: https://github.com/latex-ninja/colour-theme-changing-class-tutorial-
It is a reference document for this blogpost.
Here, we will introduce 13 stylish box design examples for your LaTeX document. The main package used in this example is tcolorbox and mathspec for better font selection. The rest of the packages in this project are optional.