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    background:url(https://www.cnblogs.com/images/cnblogs_com/runningRookie/1493480/o_xiamu_smile.jpg) fixed;
}
#top{
    background-color: rgba(255,255,255, 0);
}
#sub{
    background-color: rgba(0,0,0, 0.4);
}
#content {
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}
.post .postfoot {
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    margin-top: 14px;
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}*/