.embed-responsive-16by13::before{aspect-ratio:16/13}.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-24by19::before{aspect-ratio:24/19}.embed-responsive-24by20::before{aspect-ratio:24/20}.embed-responsive-3by4::before{aspect-ratio:3/4}.embed-responsive-4by3::before{aspect-ratio:4/3}.embed-responsive-41by48::before{aspect-ratio:41/48}.embed-responsive-48by37::before{aspect-ratio:48/37}