.embed-responsive-16by9{aspect-ratio:16/9}.embed-responsive-16by9::before{padding-top:56.25%}.embed-responsive-2by3{aspect-ratio:2/3}.embed-responsive-2by3::before{padding-top:150.00%}.embed-responsive-3by2{aspect-ratio:3/2}.embed-responsive-3by2::before{padding-top:66.67%}.embed-responsive-8by5{aspect-ratio:8/5}.embed-responsive-8by5::before{padding-top:62.50%}