body{
     margin : 0 auto ;
     padding : 0 ;
}
.header{
    padding-left: 100px;
    padding-top: 25px;
    border: 1px solid #e6e4e4;
}
a.headermaintitle:link {
    color: #000;
    font-size: 20px;
    font-weight: bold;
    font-family: "微软雅黑";
    text-decoration: none;
    letter-spacing: 2px;
    font-style: italic;
}
#leftcontent{
    top: 178px;
    left: 10px;
    border: 1px solid #E6e4e4;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
#mytopmenu{
    margin-left: 240px;
    margin-right: 10px;
    margin-top: 5px;
    border: 1px solid #E6e4e4;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
.footer{
    width:100%;
    margin:0;
    position:absolute;
    bottom:0;
}