Pure CSS solution to embed responsive youtube videos on web pages

Here is a quick solution for how to add youtube video on your website:

HTML Code:

<div class="video-container"> 
    <iframe width="640" height="360" src="//www.youtube.com/embed/ukKd8W3Bvo0" frameborder="0" allowfullscreen></iframe>
</div>

CSS Code:

.video-container {
    position: relative;
    padding-bottom: 56.25%; /*16:9*/  
    padding-top: 30px;
    height: 0;
    overflow: hidden;
}
.video-container iframe,
.video-container object,
.video-container embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}