Board Thread:Support Requests - Designing Your Wiki/@comment-36009152-20190523212557/@comment-9605025-20190524000311

This CSS. Pulling out the relevant parts are reformatting to my liking: The parameter impacts the heading by adding a class to the div. This additional class is used by the above CSS to change the colors. Basically, you provide the template parameter a value and that determines which colors are used.

A version which doesn't use site-wide CSS would be something like this:   You can change the default colors and header text if you want. This template has the following parameters:
 * text - text to display; "Header Text" by default
 * link - page to link to; does not link by default
 * background color - color for background; red by default
 * text color - color for text (whether a link or not); green by default