body {
    color:#000;
    background-color: #e6e6e6;
    background: url("https://images.cnblogs.com/cnblogs_com/1000Suns/1494761/o_background.jpg")fixed no-repeat top center;
    font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
    font-size: 12px;
    min-height: 101%;
    background-size: 55% 100%;
    box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
    opacity: 0.8;
}