In CSS files, we are having various inconsistency in the formatting of the code for e.g. we have following types of code formatting
// No space
// Space of 2
// Space of 4
For better readability we should format the existing files with space of 4.
Also for some theme, we named CSS files as maincss.css and for some, we named it as style.css. We can rename these file as per best practices for consistency.