.embed-responsive-1by1::before{aspect-ratio:1/1}.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-2by1::before{aspect-ratio:2/1}.embed-responsive-24by5::before{aspect-ratio:24/5}.embed-responsive-4by3::before{aspect-ratio:4/3}.embed-responsive-48by37::before{aspect-ratio:48/37}.embed-responsive-8by3::before{aspect-ratio:8/3}