.embed-responsive-4by3{aspect-ratio:4/3}.embed-responsive-4by3::before{padding-top:75.00%}.embed-responsive-48by31{aspect-ratio:48/31}.embed-responsive-48by31::before{padding-top:64.58%}.embed-responsive-48by47{aspect-ratio:48/47}.embed-responsive-48by47::before{padding-top:97.92%}