#content 
{
    width: 100%;
    max-width: 770px;

}

.responsiveContainer 
{
    position: relative;
    padding-bottom: 56%;
    height: 0;
    overflow: hidden;
}

.responsiveContainer iframe 
{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}