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<style>
#aa{
height:100px;
background:#ddd;
}
.a,.b{
float:right;
width:50px;
height:50px;
margin:10px;
border:1px solid #fff;
margin-top:-60px;
}
.a{
background:#aaa;
}
.b{
background:#bbb;
}
</style>
</head>
<body>
<div id = "aa">
</div>
<div>
<span class = "a"></span>
<span class = "b"></span>
</div>
</body>