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.box {
    width:100%;
    height:100px;
}
.box:after {
    content:"";
    display:block;
    visibility:hidden;
    height:0;
    clear:both;
}
.left {
    float:left;
    position:relative;
    width:100px;
    background:#003b6a;
    height:100px;
    margin-right:-100px;
}
.right {
    float:right;
    width:100%;
    height:100px;
}
.right_content {
    margin-left:100px;
    height:100px;
    background:#9fceec;
}
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