Responsive embeds automatically adjust to the containing element.
<div class="embed-responsive embed-responsive-16by9">
<iframe class="embed-responsive-item" title="How to paraphrase" src="https://www.youtube.com/embed/oTsE-LRSo_M" allowfullscreen></iframe>
</div>
div
to contain the embeddiv
embed-responsive
embed-responsive-16by9
or embed-responsive-4by3
depending on the aspect ratio of the contentembed-responsive-item
to the iframe, video, etc.That's it. You know have an embed that adjusts it's size based on the containing element.
For further information and options concerning responsive embeds, please see the following website: