.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-2by3::before{aspect-ratio:2/3}.embed-responsive-20by24::before{aspect-ratio:20/24}.embed-responsive-24by13::before{aspect-ratio:24/13}.embed-responsive-24by14::before{aspect-ratio:24/14}.embed-responsive-3by2::before{aspect-ratio:3/2}.embed-responsive-3by4::before{aspect-ratio:3/4}.embed-responsive-48by31::before{aspect-ratio:48/31}.embed-responsive-8by5::before{aspect-ratio:8/5}