.embed-responsive-1by1::before{aspect-ratio:1/1}.embed-responsive-3by1::before{aspect-ratio:3/1}.embed-responsive-31by48::before{aspect-ratio:31/48}.embed-responsive-4by3::before{aspect-ratio:4/3}.embed-responsive-48by29::before{aspect-ratio:48/29}.embed-responsive-48by43::before{aspect-ratio:48/43}.embed-responsive-8by5::before{aspect-ratio:8/5}.embed-responsive-8by7::before{aspect-ratio:8/7}