Board Thread:Support Requests - Getting Technical/@comment-1358822-20140517053434

I'm trying to make the background colors for headers on all of the tables in my wiki maroon. I know how to do this in source mode on each individual table, but I can't figure out how to do it with all the tables on the wiki as a whole, without going through each individual table. I was directed to the CSS of my wiki, but since I know nothing about code, I can't figure out how to do it. Can someone tell me what I have to do?  