.rotated-90 {
    -webkit-transform: rotate(90deg); /* Chrome, Safari 3.1+ */
    -moz-transform: rotate(90deg); /* Firefox 3.5-15 */
    -ms-transform: rotate(90deg); /* IE 9 */
    -o-transform: rotate(90deg); /* Opera 10.50-12.00 */
    transform: rotate(90deg); /* Firefox 16+, IE 10+, Opera 12.10+ */
    transition: transform 200ms;
}