<div id='legend-content' style='display:none;'>
<div class='legend'>
<div class='legend-title'>My title</div>
<div class='legend-title'>My sub-title</div>
</div>
</div>

.legend .legend-title {
    text-align: Center;
    margin-bottom: 8px;
    font-weight: bold;
    font-size: 120%;
    color: #ffffff;
    }

.legend{
    background: rgba(80,80,80,0.3);
       }

.map-legend.wax-legend {
    background: rgba(80,80,80,.1);
    }