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background-size: cover; -moz-background-size: cover; 
background-image: 
url('https://images2015.cnblogs.com/blog/1098482/201703/1098482-20170318145231916-1513929066.jpg');
background-repeat: no-repeat; 
background-attachment:fixed;
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font-size:15px;
font-family:微软雅黑;
}



#home {
opacity: 0.7;
width:1200px;
background-color:#f5f5f5;
}
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