Board Thread:Support Requests - Designing Your Wikia/@comment-26408193-20151014174717/@comment-4731443-20151017024512

Did you... create a wiki just for testing templates? You know, you can use sandbox.wikia.com for that.

As for colors, you can simply change the background-color property of the desired elements. For example, background-color: #DEDEDE; will make it an ivory white.