body {
    color: 	#FF3030;
    background:url(https://images7.alphacoders.com/685/685511.jpg) fixed;
    background-position:center;
    background-size:cover;
    background-repeat: no-repeat;
    font-family: "微软雅黑" , "PTSans" , "Arial" ,sans-serif;
    font-size: 18px;
    min-height: 101%;
    opacity: 0.8;
}