.embed-responsive-16by11::before{aspect-ratio:16/11}.embed-responsive-16by7::before{aspect-ratio:16/7}.embed-responsive-2by3::before{aspect-ratio:2/3}.embed-responsive-3by2::before{aspect-ratio:3/2}.embed-responsive-4by3::before{aspect-ratio:4/3}.embed-responsive-8by3::before{aspect-ratio:8/3}