这样对吗？
#box3{
width:200px;
height:200px;
position:absolute;
}
#box4{
width:99%;
position:relative;
bottom:43px;
}
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#box3{
width:200px;
height:200px;
position:absolute;
}
#box4{
width:99%;
position:relative;
bottom:43px;
}
2015-01-22
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