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# 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-item` when you want to match the styling for other attributes.

Pro-Tip! You don’t need to include `frameborder="0"` in your `<iframe>`s as we override that for you.

## 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;