html, body {
    height: 100%;
    margin: auto;
    font: 14px black Verdana,Arial,Helvetica,sans-serif;
    line-height: 1.5;
    background: url(https://images.cnblogs.com/cnblogs_com/Tibbers/1763152/o_2005120422083.gif) top left #e9f1f8;
}
#topics {
    margin: 30px 10px auto 30px;
    border: solid 0 #f00;
    opacity: 0.9;
}

#right {
    float: left;
    width: 220px;
    margin-left: 10px;
    text-align: center;
    border: 1px #676767 dashed;
    background: #fff;
    padding-bottom: 20px;
    color: #666;
    opacity: 0.8;
}