Play Button Overlay: Hover / Fade Overlay with centered play button

CSS

.vid-clip-sm {
  width: 121px;
  height: 88px;
  position: relative;
  margin: 0 8px 8px 0;
  float: left;
}

.vid-clip-sm .vid-clip-play {
  width: 121px;
  height: 88px;
  position: absolute;
  top: 0;
  left: 0;
  -webkit-transition-property: background-color;
  -moz-transition-property: background-color;
  -o-transition-property: background-color;
  transition-property: background-color;
  -webkit-transition-duration: 0.4s;
  -moz-transition-duration: 0.4s;
  -o-transition-duration: 0.4s;
  transition-duration: 0.4s;
}

.vid-clip-sm .vid-clip-play:hover {
  background-color: rgba(0, 0, 0, 0.3);
  filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr='#66000000', endColorstr='#66000000'); /* IE */

}

.vid-clip-sm .vid-clip-play img {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -22px 0 0 -22px;
  width: 44px;
}

HTML

<div class="vid-clip-sm">
  <img src="http://fpoimg.com/121x88">
  <div class="vid-clip-play">
    <img src="/images/btn-play.png">
  </div>
</div>