.embed-responsive{position:relative;display:block;width:100%;padding:0;overflow:hidden}.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-1by1{padding-bottom:100%}.embed-responsive-4by3{padding-bottom:75%}.embed-responsive-16by9{padding-bottom:56.25%}.embed-responsive-21by9{padding-bottom:42.85714286%}