MediaWiki:Common.css

/* CSS placed here will be applied to all skins */

mw-panel { background-color: #e6ffb4; }

/* Collapsible elements. Toggle-link moved to left.
/* Margin around it adjusted. */

.mw-collapsible-toggle-default:before, .mw-collapsible-toggle-default:after {
    display: none;
}