.embed-responsive-24by20{aspect-ratio:24/20}.embed-responsive-24by20::before{padding-top:83.33%}.embed-responsive-4by3{aspect-ratio:4/3}.embed-responsive-4by3::before{padding-top:75.00%}.embed-responsive-43by48{aspect-ratio:43/48}.embed-responsive-43by48::before{padding-top:111.63%}.embed-responsive-48by37{aspect-ratio:48/37}.embed-responsive-48by37::before{padding-top:77.08%}