vBulletin Manual - <select> Menus

CSS Selector: select

This class is applied to every <select> menu seen in vBulletin.

Due to operating system limitations, only certain CSS attributes will be applied to <select> tags, as the majority of their display code is controlled directly by the operating system itself.

You should find that you can set values for background color, font size and font family successfully. However, certain operating systems; most notably Mac OS X on the Apple Macintosh, will completely ignore all CSS applied to <select> tags, choosing instead to use the system themes engine to display the menus.

Example of element using this class:

<select name="myselect">
    <option value="1">One</option>
    <option value="2">Two</option>
</select>
<div>The SELECT tag above has its style controlled by this class.</div>