body{
    background-color: #FFF9F4;
    margin:0;
    padding:0;
}
#top{
    width:100%;
    height:50px;
    line-height:50px;
    margin-left:auto;
    margin-right:auto;
    background-color: #FF6820;
    font-size:20px;
    font-family: 黑体;
    color:#FFFFFF;
    text-align:center;
}
#b{
    margin-top:5px;
    margin-left:auto;
    margin-right:auto;
    width:100%;
    height:auto;
    text-align:center;
}