*{
    margin: 0;
    padding: 0;
}
html,body{
    width: 100%;
    height: 100%;
    font-size: 62.5%;
}
.l_content{
    width: 100%;
    height: 100%;
    background-color: #e6e6e6;
}
.bo{
    border: 1px solid #fe0000;
}
.clearFloat:after{
    clear: both;
    display: block;
    visibility: hidden;
    content: "";
    height: 0;
}
.clearFloat{
    zoom: 1;
}
.left{
    float: left;
}
.right{
    float: right;
}