Videos
Create responsive video or slideshow embeds based on the width of the parent by creating an intrinsic ratio that scales on any device.
Rules are directly applied to <iframe>, <embed>, <video>, and <object> elements; optionally use an explicit descendant class .embed-responsive-item when you want to match the styling for other attributes.
Example
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.
<div class="embed-responsive embed-responsive-16by9">
<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/c5CaIOgNjnU?rel=0" allowfullscreen></iframe>
</div>Aspect ratios
Aspect ratios can be customized with modifier classes.
21:9 aspect ratio
16:9 aspect ratio
4:3 aspect ratio
1:1 aspect ratio
<div class="row">
<div class="col-lg-6 mb-3">
<h3>21:9 aspect ratio</h3>
<div class="embed-responsive embed-responsive-21by9">
<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/c5CaIOgNjnU?rel=0" allowfullscreen></iframe>
</div>
</div>
<div class="col-lg-6 mb-3">
<h3>16:9 aspect ratio</h3>
<div class="embed-responsive embed-responsive-16by9">
<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/c5CaIOgNjnU?rel=0" allowfullscreen></iframe>
</div>
</div>
<div class="col-lg-6 mb-3">
<h3>4:3 aspect ratio</h3>
<div class="embed-responsive embed-responsive-4by3">
<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/c5CaIOgNjnU?rel=0" allowfullscreen></iframe>
</div>
</div>
<div class="col-lg-6 mb-3">
<h3>1:1 aspect ratio</h3>
<div class="embed-responsive embed-responsive-1by1">
<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/c5CaIOgNjnU?rel=0" allowfullscreen></iframe>
</div>
</div>
</div>