body {
    color: #000;
    background-color: #e6e6e6;
    font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
    font-size: 12px;
    min-height: 101%;
   background:url(https://images.cnblogs.com/cnblogs_com/QEEZ/1639420/o_200130112830379-1FQ1141954.jpg) fixed;
}
#home {
margin: 0 auto;
opacity: 0.8;
width: 65%;
min-width: 1080px;
background-color: #fff;
padding: 30px;
margin-top: 50px;
margin-bottom: 50px;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
}
/* 定制返回顶部按键 */
#toTop {
    background: url(https://images.cnblogs.com/cnblogs_com/QEEZ/1639763/o_200131083331rocket_110.7968pxt.png) no-repeat 0px top;
    width: 108px;
    height: 108px;
    overflow: hidden;
    position: fixed;
    right: 12px;
    bottom: 20px;
    cursor: pointer;
}