When you have a long list of css, it will be a good idea to organise or split the css contents into groups or categories. Why you should include css files separately? Well, by splitting them into a small files, it will be easier to maintain and read the css code file.

To import a css file you can use the following import function.

@import url('/path1/main.css');
@import url('/path2/color.css');
@import url('/path3/headings.css');

The above import functions are placed inside a css file.