How to input php to css

[Easy5s.net]

Originally Posted by Lynne

The forumid is used as an id for each row, ie. forum id 2 has an id of forum2. So, just write some CSS for it like:

#forum1 .forumrow, #forum3 .forumrow {background-color: red;}

Do similar for forumid2 and forumid4.

Yes, I understand this, but I want to write a plugin or insert php to additional.css. When create one makes the box without having to manually edit.