/* 
    Responsive Image with Set Aspect Ratio
    Thanks: http://daverupert.com/2012/04/uncle-daves-ol-padded-box/
*/
.img-aspect-16-9 {
    background-repeat: no-repeat;
    background-position: center top;
    background-size: cover;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 */
}
.img-aspect-4-3 {
    background-repeat: no-repeat;
    background-position: center top;
    background-size: cover;
    height: 0;
    padding-bottom: 75%; /* 4:3 */
}