<div class="waiceng" ><div class="guangggao"><a href="#" src=""><img src=""></a></div></div> 美化

.waiceng {
    width: 100px;
    height: 100px;
    border: 1px solid #ccc;
  }
  .guanggao {
    width: 100px;
    height: 100px;
    background-color: green;
    display: inline-block;
  }
  .guanggao img {
    width: 100px;
    height: 100px;
  }