.embed-responsive-1by1{aspect-ratio:1/1}.embed-responsive-1by1::before{padding-top:100.00%}.embed-responsive-3by2{aspect-ratio:3/2}.embed-responsive-3by2::before{padding-top:66.67%}.embed-responsive-3by4{aspect-ratio:3/4}.embed-responsive-3by4::before{padding-top:133.33%}