How To Make a Responsive 100% Width YouTube iFrame Embed

The key to creating a responsive YouTube embed is with padding and a container element, which allows you to give it a fixed aspect ratio. You can also use this technique with most other i frame-based embeds, such as slideshows.

Here is what a typical YouTube embed code looks like, with fixed width and height:

<iframe src="https://www.youtube.com/embed/OL_OI4aKkR8?playlist=OL_OI4aKkR8&loop=1&autoplay=1&controls=0&modestbranding=1&showinfo=0&mute=1"  allowfullscreen class="video"></iframe>
It would be nice if we could just give it a 100% width, but it won't work as the height remains fixed. What you need to do is wrap it in a container like so (note the class names and removal of the width and height):

<div class="container">
<iframe src="https://www.youtube.com/embed/OL_OI4aKkR8?playlist=OL_OI4aKkR8&loop=1&autoplay=1&controls=0&modestbranding=1&showinfo=0&mute=1"  allowfullscreen class="video"></iframe>
</div>
And use the following CSS:

.container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}
.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
How this works: The container element is given a zero height and a percentage bottom padding. The percentage bottom padding is a percentage of the container width, so that gives it a fixed aspect ratio. But in order to get the iframe to show up inside the zero-height container, you need to make the container relative and the iframe absolute, positioned inside the div. 

How To Make a Responsive 100% Width YouTube iFrame Embed