<p>For specific infoboxes? You simply give an infobox a <i>
type</i> or <i>
theme</i>, such as
<infobox type="character">, and put something like <i>this</i> in Wikia.css, depending on the type you gave the infobox:
</p>
<div dir="ltr" class="mw-geshi mw-content-ltr"><div class="css source-css">
<span class="re1">.portable-infobox</span><span class="re1">.type-character</span> .pi-title<span class="sy0">,</span>
<span class="re1">.portable-infobox</span><span class="re1">.type-character</span> <span class="re1">.pi-header</span> <span class="br0">{</span>
<span class="kw1">background</span><span class="sy0">:</span> <span class="sy0">;</span>
<span class="kw1">color</span><span class="sy0">:</span> <span class="sy0">;</span>
<span class="br0">}</span></div></div>
<p>Doing it for different themes is pretty much the same thing, except you state theme instead of type.
</p>