<style>
.embed-responsive {
position: relative;
display: block;
overflow: hidden;
width: 100%;
padding: 0;
}
.embed-responsive-16by9::before {
padding-top: 56.25%;
}
.embed-responsive::before {
display: block;
content: '';
box-sizing: border-box;
}
.embed-responsive .embed-responsive-item, .embed-responsive embed, .embed-responsive iframe, .embed-responsive object, .embed-responsive video {
position: absolute;
top: 0;
bottom: 0;
left: 0;
width: 100%;
height: 100%;
border: 0;
}
</style>
<div class="embed-responsive embed-responsive-16by9">
<iframe
src="https://vk.com/video_ext.php?oid=-224656740&id=456239061&hd=2"
class="embed-responsive-item">
</iframe>
</div>