.embed-responsive {position:relative;display:block;width:100%;padding:0;overflow:hidden }.embed-responsive::before {display:block;content:"" }.embed-responsive .embed-responsive-item,.embed-responsive iframe,.embed-responsive embed,.embed-responsive object,.embed-responsive video {position:absolute;top:0;bottom:0;left:0;width:100%;height:100%;border:0 }.embed-responsive-21by9::before {padding-top:42.8571428571% }.embed-responsive-16by9::before {padding-top:56.25% }.embed-responsive-3by4::before {padding-top:133.3333333333% }.embed-responsive-1by1::before {padding-top:100% }