User blog comment:FastLizard4/New Skin and AJAX RC/@comment-49212-20100122214330

Ah, I thought you meant colours across different templates. This works on that page, colours just an example to make it clear:

.infobox {color: #000 !important; border: 1px solid #999 !important;} .infobox th {background: #ff6 !important; border: 1px solid #999 !important;} .infobox td:first-child {background: #ff9 !important;} .infobox td[colspan="4"] {background: #fff !important;} .infobox td {background: #ffb !important; border: 1px solid #999 !important;}

It appears that every infobox but Template:Infobox Game System has exactly the same structure, so seems it could be applied to any, and would work for that one too. However, some infoboxes have colspan="2" for the headers; this has colspan="4" for the headers and colspan="2" for the half-width tds - this is an easy fix, though, and won't affect anything else.

Oh, and research says all that should work in IE7+ and decent browsers, and we're not meant to be caring about IE6 any longer, right?