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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.

Pro-Tip! You don't need to include `frameborder="0"` in your `

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/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-ratios` list:

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