.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 embed,.embed-responsive iframe,.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-4by3:before{padding-top:75%}.embed-responsive-1by1:before{padding-top:100%}