html {
    height: 100%;
    overflow: hidden;
}

body {
    position: relative; /* 后面的 position: absolute; 都以此为准 */
    background-color: rgb(121, 146, 123);
    background-image: url(../login.jpg);
    background-position:top center;
    background-repeat: no-repeat;
    background-size: contain;
    background-attachment: fixed;
    padding: 0rem;
    height: 100%;
    font-family: "Microsoft YaHei",微软雅黑;
}

.full-height {
    height: 100%;
}