MediaWiki:Foreground.css

.top-bar, 
.top-bar-section ul,
.top-bar-section ul li,
.top-bar-section ul li.active > a, 
.top-bar-section li a:not(.button), 
.top-bar-section .has-form
{
    background: #CBA574;
}

.top-bar-section > ul > .divider,
.top-bar-section > ul > [role="separator"] {
  border-color: black;
}