.embed-responsive-1by3::before{aspect-ratio:1/3}.embed-responsive-11by24::before{aspect-ratio:11/24}.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-24by17::before{aspect-ratio:24/17}.embed-responsive-3by2::before{aspect-ratio:3/2}.embed-responsive-3by4::before{aspect-ratio:3/4}.embed-responsive-4by3::before{aspect-ratio:4/3}.embed-responsive-48by35::before{aspect-ratio:48/35}.embed-responsive-9by16::before{aspect-ratio:9/16}