.embed-responsive-16by9{aspect-ratio:16/9}.embed-responsive-16by9::before{padding-top:56.25%}.embed-responsive-3by4{aspect-ratio:3/4}.embed-responsive-3by4::before{padding-top:133.33%}.embed-responsive-4by3{aspect-ratio:4/3}.embed-responsive-4by3::before{padding-top:75.00%}.embed-responsive-48by35{aspect-ratio:48/35}.embed-responsive-48by35::before{padding-top:72.92%}.embed-responsive-48by37{aspect-ratio:48/37}.embed-responsive-48by37::before{padding-top:77.08%}