.embed-responsive-1by3::before{aspect-ratio:1/3}.embed-responsive-16by11::before{aspect-ratio:16/11}.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-2by3::before{aspect-ratio:2/3}.embed-responsive-24by17::before{aspect-ratio:24/17}.embed-responsive-4by3::before{aspect-ratio:4/3}.embed-responsive-48by35::before{aspect-ratio:48/35}.embed-responsive-48by37::before{aspect-ratio:48/37}