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 iframe-based embeds, such as slideshows.

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

<iframe width="560" height="315" src="//"
frameborder="0" allowfullscreen></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="//"
frameborder="0" allowfullscreen class="video"></iframe>

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.

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Hi I'm Rene Vigar

Hi, I’m Rene Vigar, a UX UI Designer with front-end development skills. Join me here, on for weekly tips and tutorials about UX UI Design and UI Development. I am also a part-time blogger writing for Medium, Forbes, Entrepreneur, Inc, Business Insider and more.