.box1{
width:200px;
height:200px;
background-color:#0bcd96;
position:relative;z-index:3;
}
.box2{
width:200px;
height:200px;
background-color:#1e389a;
position: absolute;left:100px;top:100px;
}
.box3{
width:200px;
height:200px;
background-color:#6a1752;
position: relative;z-index:2;
}
背影
.box1{
width:400px;
height:300px;
margin:0auto;
background-color:#000;
background-image:url(../css/logo_new@2x.png);
background-repeat:no-repeat;
}
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