File: htdocs/modules/system/themes/default/css/tooltip.css

/*
 * Default Admin Theme
 *
 * @copyright       (c) 2000-2015 XOOPS Project (www.xoops.org)
 * @license         http://www.fsf.org/copyleft/gpl.html GNU public license 3.0
 * @package         themes
 * @since           2.5.x
 * @author          Xoops Design Theme <http://www.xoops.org/>
 * @maintained      Xoops Design Theme <http://www.xoops.org/>
 *
*/
#tooltip {
    position: absolute;
    background: #D2E2F9;
    padding: 10px;
    color: #333;
    display: none;
    border: 1px solid #A4C3EF;
    -moz-border-radius: 3px;
    -webkit-border-radius: 3px;
    border-radius: 3px;
    box-shadow:             3px 2px 3px rgba(0,0,0,0.5);
    -moz-box-shadow:         3px 2px 3px rgba(0,0,0,0.5);
    -webkit-box-shadow:     3px 2px 3px rgba(0,0,0,0.5);
    filter: alpha(opacity = 80);
    -moz-opacity: 0.8;
    -webkit-opacity: 0.8;
    opacity: 0.8;
}

#tooltip span {
  font-size: 11px;
  font-weight: bold;
  text-align: center !important;
}

#tooltip img {
  padding-bottom: 10px !important;
  text-align: center !important;
}