让一张图片显示在另一张图片之上

css:

.imgbox{position: relative;text-align: center;}
.logo{position: absolute;left: 0px;bottom: 0px;text-align: center;width: 100%;}

html:

<div class="imgbox" >
  ![]($!img)
  <div class="logo">
    ![]($!logo)
  </div>
</div>