.embed-responsive{position:relative;display:block;width:100%;padding:0;overflow:hidden}.embed-responsive::before{display:block;content:""}.embed-responsive-video{position:absolute;top:0;bottom:0;left:0;width:100%;height:100%;border:0}.embed-responsive-169::before{padding-top:56.25%}.embed-responsive-43::before{padding-top:75%}