Use generated pseudo elements to make an element maintain a chosen aspect ratio; great for handling video and slideshow embeds.
Use the ratio helper to manage the aspect ratios of external content like
<object>. These helpers also can be used on any standard HTML child element (e.g., a
<img>). Styles are applied from the parent
.ratio class directly to the child. Please note, you don't need
frameborder="0" on your
<iframe> elements as we override that.
Wrap any embed, like an
<iframe>, in a parent element with
.ratio and an aspect ratio class. The immediate child element is automatically sized thanks to our universal selector
.ratio > *.
<div class="ratio ratio-16x9 specific-w-450 mw-100 mx-auto rounded-3 overflow-hidden"> <iframe src="https://www.youtube.com/embed/X59FCW3vOlE" title="YouTube video" allowfullscreen></iframe> </div>
Aspect ratios #
Aspect ratios can be customized with the following modifier classes:
<div class="ratio ratio-1x1"> <div>1x1</div> </div> <div class="ratio ratio-4x3"> <div>4x3</div> </div> <div class="ratio ratio-16x9"> <div>16x9</div> </div> <div class="ratio ratio-21x9"> <div>21x9</div> </div>
Custom ratios #
.ratio-* class includes a CSS variable in the selector. You can override this CSS variable to create custom aspect ratios on the fly with some quick math on your part. For example, to create a 2x1 aspect ratio, set
--bs-aspect-ratio: 50% on the
<div class="ratio" style="--bs-aspect-ratio: 50%;"> <div>2x1</div> </div>
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