.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-24by10::before{aspect-ratio:24/10}.embed-responsive-24by13::before{aspect-ratio:24/13}.embed-responsive-3by2::before{aspect-ratio:3/2}.embed-responsive-4by3::before{aspect-ratio:4/3}