body{
background-image: url("https://images.cnblogs.com/cnblogs_com/yafeng666/1623167/t_200329042232reba7.bmp"); background-position: initial; background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-origin: initial; background-clip: initial;
height:100%;
width:100%;
}

#home{
    opacity:0.7;
}

#back-to-top {
    background-color: #4e4e4e;
    bottom: 0;
    box-shadow: 0 0 6px #00CD00;
    color: #444444;
    padding: 10px 10px;
    position: fixed;
    right: 50px;
    cursor: pointer;
}

/*目录样式*/
#sideCatalog a{
  font-size:12px;
  font-weight:normal !important;
}