Source

Embeds

Create responsive video or slideshow embeds based on the width of the parent by creating an intrinsic ratio that scales on any device.

About

Rules are directly applied to <iframe>, <embed>, <video>, and <object>elements; optionally use an explicit descendant class .embed-responsive-itemwhen you want to match the styling for other attributes.

Pro tip! You don't need to include frameborder="0"in yours <iframe>as we override that for you.

example

Wrap any embed like an <iframe>in a parent element with .embed-responsiveand an aspect ratio. The .embed-responsive-itemisn'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/zpOULjyy-n8?rel=0" allowfullscreen></iframe>
</div>

Aspect ratios

Aspect ratios can be customized with modifier classes. By default the following ratio classes are provided:

<!-- 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>

Within _variables.scss, you can change the aspect ratios you want to use. Here's an example of the $embed-responsive-aspect-ratioslist:

$embed-responsive-aspect-ratios: (
  (21 9),
  (16 9),
  (3 4),
  (1 1)
) !default;