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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.

<div class="embed-responsive embed-responsive-16by9">
    <iframe class="embed-responsive-item" src="..."></iframe>
</div>

 

How to do a Responsive YouTube video embed?

Copy the paste below and replace the string.

 

<div class="embed-responsive embed-responsive-16by9">
    <iframe src="https://www.youtube.com/embed/h-FMndW2kHo" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
</div>

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