.embed-responsive-16by9{aspect-ratio:16/9}.embed-responsive-16by9::before{padding-top:56.25%}.embed-responsive-24by10{aspect-ratio:24/10}.embed-responsive-24by10::before{padding-top:41.67%}.embed-responsive-4by3{aspect-ratio:4/3}.embed-responsive-4by3::before{padding-top:75.00%}.embed-responsive-8by3{aspect-ratio:8/3}.embed-responsive-8by3::before{padding-top:37.50%}