#home{
    opacity: 0.8;
    box-shadow: 0 0 10px #000;
}
body {
    font-family: -apple-system,SF UI Text,Arial,PingFang SC,Hiragino Sans GB,Microsoft YaHei,WenQuanYi Micro Hei,sans-serif;
    font-size: 18px;
    background: #e6e6e6 
 url(//files.cnblogs.com/files/xxxin/c3f398b6gy1fls3824uq1j21hc0xc778.gif) no-repeat top center fixed;
}
#sideBar h3{
    font-size: 20px;
}
#sideBar h2{
 font-weight: bold;
    font-size: 24px;
    color: red;
}