.embed-responsive-16by9::before{aspect-ratio:16/9}.embed-responsive-2by3::before{aspect-ratio:2/3}.embed-responsive-24by13::before{aspect-ratio:24/13}.embed-responsive-3by2::before{aspect-ratio:3/2}.embed-responsive-48by29::before{aspect-ratio:48/29}.embed-responsive-8by5::before{aspect-ratio:8/5}