.embed-responsive{position:relative;display:block;width:95%;padding:0;overflow:hidden; margin:0 auto;}
.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:42.857143%}
.embed-responsive-16by9::before{padding-top:56.25%}
.embed-responsive-4by3::before{padding-top:75%}
.embed-responsive-1by1::before{padding-top:100%}