body {height:100%;position:fixed;width:100%;background:#eee;}
.top-wrap {position:relative;top:4vh;width:80%;margin:0 auto;max-width:1200px;}
.container {font-size:2rem;text-align:center;top:30vh;position:relative;}
.container p {width: 80%;margin: 0 auto;}

/* 移动端 */
@media only screen and (max-width:640px){
    .container {font-size:1.5rem;text-align:center;top:30vh;position:relative;}
}