video bootstrap
<!-- 21:9 aspect ratio --> <div class="embed-responsive embed-responsive-21by9"> <iframe class="embed-responsive-item" src="..."></iframe> </div> <!-- 16:9 aspect ratio --> <div class="embed-responsive embed-responsive-16by9"> <iframe class="embed-responsive-item" src="..."></iframe> </div> <!-- 4:3 aspect ratio --> <div class="embed-responsive embed-responsive-4by3"> <iframe class="embed-responsive-item" src="..."></iframe> </div> <!-- 1:1 aspect ratio --> <div class="embed-responsive embed-responsive-1by1"> <iframe class="embed-responsive-item" src="..."></iframe> </div>