HTML代码
<body>
<div class="right"></div>
<div class="left"></div>
</body>
CSS代码
*{
margin:0;
padding:0;
}
.right{
position:absolute;
right:0;
width:100px;
height:100px;
background-color:#fcc;
opacity:0.5; //透明度
}
.left{
margin-right:100px;
height:100px;
background-color:#123;
}
原文：https://www.cnblogs.com/xibuhaohao/p/10343088.html