User:Timeshifter/Sandbox20

class="navbox mw-collapsible mw-collapsed"

style="background-color:xxxxx; color:black;"

style="background:xxxxx; color:black;"

class="navbox collapsible collapsed"

style="background:xxxxx; color:black;"

It can take 5 to 15 minutes for color change to show up after changing navbox header background color in MediaWiki:Wikia.css.

Forum: Change color of expand-collapse link - Wikia Community Central.

[http://stackoverflow.com/questions/10205464/whats-the-difference-between-specifying-background-vs-background-color-in css - What's the difference between specifying `background` vs. `background-color` in `body`? - Stack Overflow].

Use background in MediaWiki:Wikia.css. It will override anything in core CSS. Use background-color as inline style in headers. Otherwise sorting is broken. See Wikipedia:Help:Sorting.