Definition
Css comments are used to explain the code and they are not displayed in the browser. Its helpful to understand/edit/debug the source code later.
Comment starts with "/*" and ends with "*/". It must be under <style> tag.
1/*
2 Comment 1
3 it can be multiline like this
4 ...
5*/
6p {
7 background-color: blue; /*Comment 2*/
8}