.embed-responsive-1by1::before{aspect-ratio:1/1}.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-24by11::before{aspect-ratio:24/11}.embed-responsive-24by19::before{aspect-ratio:24/19}.embed-responsive-3by1::before{aspect-ratio:3/1}.embed-responsive-3by2::before{aspect-ratio:3/2}