MediaWiki:Tooltips.css

/* Main CSS class of the tooltip */
.main-tooltip {
    border: 1px solid #cac4b5;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
    margin-bottom: 5px;
    padding: 2px 5px;
    background-color: #fbeecb;
}

/* Adds padding to the wrapper to make space for a shadow */
#tooltip-wrapper {
    padding: 3px 7px 2px 3px;
}

/* Hides tooltips with redlinks, not yet loaded ones and elements containing tooltip contents for advanced tooltips */
.has-redlinks, .tooltip-loading, .advanced-tooltip .tooltip-contents {
    display: none;
}

.tooltips-init-complete {
    cursor: help;
}

/* Align images with text the same way it's in page content */
/* Was probably better to play with the classes but that would cause ton of side effects */
.main-tooltip img {
    vertical-align: middle;
}