CSS background-size background-size : auto : See the Pen <a href="http://codepen.io/w3tr/pen/RRrmaX/">background-size : auto</a> by W3TR (<a href="http://codepen.io/w3tr">@w3tr</a>) on <a href="http://codepen.io">CodePen</a>.<br /> length : See the Pen <a href="http://codepen.io/w3tr/pen/oLqRLm/">background-size: length</a> by W3TR (<a href="http://codepen.io/w3tr">@w3tr</a>) on <a href="http://codepen.io">CodePen</a>.<br /> percentage : See the Pen <a href="http://codepen.io/w3tr/pen/PzRvGq/">background-size: percentage</a> by W3TR (<a href="http://codepen.io/w3tr">@w3tr</a>) on <a href="http://codepen.io">CodePen</a>.<br /> cover : See the Pen <a href="http://codepen.io/w3tr/pen/QEmRKd/">background-size: cover</a> by W3TR (<a href="http://codepen.io/w3tr">@w3tr</a>) on <a href="http://codepen.io">CodePen</a>.<br /> contain : See the Pen <a href="http://codepen.io/w3tr/pen/dXmEpL/">background-size: contain</a> by W3TR (<a href="http://codepen.io/w3tr">@w3tr</a>) on <a href="http://codepen.io">CodePen</a>.<br />