html - CSS div with dynamic height to responsive background image -

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i trying create class dynamic image background on bootstrap3 without success. instead use height equal 180px trying use 100% make responsive. whats wrong?

.audio-cover {  	background: url("http://media.merchantcircle.com/22662073/180px-smiley_svg_full.png");  	background-size: contain;  	background-repeat: no-repeat;  	height: 100%; //instead use 180px  }
<div class="col-xs-4 col-sm-4 col-md-4 audio-cover"></div>

set background-size cover , specify min-height.

check out fiddle


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