Board Thread:Support Requests - Getting Technical/@comment-24036697-20140305190941/@comment-770155-20140306150900

It is a linear-gradient. Using an image for this is not a very good approach. Since all browsers now support gradients, images are no longer required nor desired. Taken from w:c:orcsmustdie If you have many different header colours like used over at w:c:tes, you can make use of transparency in the gradient. This gives a nice shading effect that works on nearly every colour you use: You can see the full pages at w:c:orcsmustdie:MediaWiki:Common.css and w:c:tes:MediaWiki:Common.css/infobox.css.

For the full explanation read linear-gradient on MDN.