CSS: Responsive video hack

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/***********************************************************************************************/
/* 
  http://www.developerdrive.com/2012/07/adding-responsive-videos-to-your-design/
  RESPONSIVE VIDEO HACK 
*/
/***********************************************************************************************/
/*Restrict the width of videos*/
.video-wrapper {
  width: 600px;
  max-width: 100%;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%;
  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%;
}

/*HTML*/
<div class="video-wrapper">
  <div class="video-container">
    <iframe width="640" height="360" src="//www.youtube.com/embed/3R2cnxz27LI" frameborder="0" allowfullscreen></iframe>
  </div>
</div>