The main advantages of CSS are given below:
Separation of content from presentation - CSS provides a way to present the same content in multiple presentation formats in mobile or desktop or laptop. Easy to maintain - CSS, built effectively can be used to change the look and feel complete by making small changes. To make a global change, simply change the style, and all elements in all the web pages will be updated automatically. Bandwidth - Used effectively, the style sheets will be stored in the browser cache and they can be used on multiple pages, without having to download again