How can I make the YouTube player scale to the width of the page but also keep the aspect ratio?

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What i believe to be the best CSS solution.

.auto-resizable-iframe {
  max-width: 420px;
  margin: 0px auto;
}

.auto-resizable-iframe > div {
  position: relative;
  padding-bottom: 75%;
  height: 0px;
}

.auto-resizable-iframe iframe {
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
}

<div class="auto-resizable-iframe">
  <div>
    <iframe frameborder="0" allowfullscreen="" src="http://www.youtube.com/embed/_OBlgSz8sSM"></iframe>
  </div>
</div>

Demo http://jsfiddle.net/46vp592y/

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