div.qtip-wrapper { 
    background-color: #555;
    padding: 5px 10px; 
    width: auto; 
    color: #fff !important;
    text-align: left; 
    font-size: 12px;
    z-index: 100;
    opacity: 0.9;
 
    /* outline radius for mozilla/firefox only */ 
    -moz-border-radius: 10px; 
    -webkit-border-radius: 10px; 
}

div.qtip-contentWrapper {
	background: transparent !important;
}