base.css is a collection of CSS for HTML / HTML5 tags and attributes.
The purpose of base.css is to standardize CSS for commonly used HTML tags and attributes. You could use it as is, but should be used as a “base” for your website’s CSS or as a part of a front-end framework you are using. It allows you to build your website’s or web app’s styling faster, as there is no need to rewrite typical CSS for HTML tags and attributes.
Here are the main features of base.css:
Only 5KB in size unminified and 4KB minified;
Contains typical HTML / HTML5 tags and attributes, which are regularly used or missed in CSS coding;
HTML5 ready; and
Correct common browser inconsistencies.