.gallery img{
 width:100%
}

body{
background: #e6e6e6 url(//images.cnblogs.com/cnblogs_com/staneee/1888028/o_201125005535bg1.jpg) no-repeat top center fixed;
}

#home {
    opacity: 0.95;
    box-shadow: 0 0 10px #000;
    width: 79%;
}