css 实现播放按钮

<a href="javascript:" title="重新播放" class="carton_button" >▶</a>

.carton_button {
  filter: none;
  background-color: rgba(0,0,0,.35);
  display: inline-block;
  width: 100px;
  height: 100px;
  line-height: 100px;
  border-radius: 8px;
  filter: progid:DXImageTransform.Microsoft.Gradient(startColorStr=#76000000,endColorStr=#76000000);color: #fff;
  font-size: 48px;
  text-align: center;
  text-decoration: none;
  text-shadow: 0 -1px rgba(0,0,0,.35);
}