Embed
Responsive embed video 21:9
Wrap any embed like an <iframe> in a parent element with .embed-responsive and an aspect ratio. The .embed-responsive-item isn’t strictly required, but we encourage it.
Responsive embed video 1:1
Please use class .embed-responsive-1by1 with div.
Responsive embed video 16:9
Please use class .embed-responsive-16by9 with div.
Responsive embed video 4:3
Please use class .embed-responsive-4by3 with div.