CSS stands for Cascading Style Sheets, but that’s not too important. What you do need to know is that CSS it got to do with the styling of a website.
In any website, HTML contains the headings paragraphs, lists, and images – so all the text and the images, and CSS determines how that would be displayed.
A CSS code is a code mainly used to decorate web pages in a easier more cosy way. Many web pages will display you how to use CSS and create a HTML web page.