Background problem

[mp3president]

Thanks for your reaction.

I found them, however it says this:

additional.css

.body_wrapper {
background: {vb:stylevar body_background};
}

Vbulletin.css

html {
background:{vb:stylevar doc_background};
<vb:if condition="$stylevar['textdirection'] == 'rtl'"> /* VBIV-11882 */
overflow-x: hidden;
</vb:if>

But how do i change the color of the background?