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    background: url(https://pic002.cnblogs.com/images/2011/70278/2011052216374836.jpg) no-repeat center top; 
    top: 0; 
    height: 400px; 
    position: fixed; 
    width: 100%; 
    z-index:-1; 
} 
#footer{ 
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    height: 200px; 
    position: fixed; 
    width: 100%; 
    background: url(https://pic002.cnblogs.com/images/2011/70278/2011052216374836.jpg) no-repeat center bottom; 
    z-index: -1000; 
    color: transparent; 
    display:block !important; 
}