.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-2by3::before{aspect-ratio:2/3}.embed-responsive-24by14::before{aspect-ratio:24/14}.embed-responsive-3by1::before{aspect-ratio:3/1}.embed-responsive-3by2::before{aspect-ratio:3/2}.embed-responsive-4by3::before{aspect-ratio:4/3}.embed-responsive-48by29::before{aspect-ratio:48/29}