body,html {
    width: 100%;
    height: 100%;
}
body {
    background: url(../img/m-login-bg.png);
    background-size: 100%;
}
/* 头部logo */
header {
    position: absolute;
    top: 8%;
    left: 0;
    width: 100%;
    height: 65px;
    font-size: 0;
}
header a {
    display: block;
    width: 100%;
    height: 65px;
    background: url(../img/m-logo1.png) no-repeat center center;
    background-size: 220px;
}
/* 登录框 */
section {
    position: absolute;
    top: 25%;
    width: 100%;
    padding: 0 20px;
}