html,body {
    margin: 0;
    padding: 0;
    height: 100%;
}

.warpper {
    width: 7.5rem;
    height: 100%;
    background: url('../images/bg.jpg') center top no-repeat;
    background-size: 100%;
}

.box-btn {
    position: absolute;
    width: 6.97rem;
    height: 1.13rem;
    bottom: 1.77rem;
    margin-left: 0.1rem;
    background: url('../images/btn.png') center top no-repeat;
    background-size: 100%;
}

.box-btn a {
    display: block;
    height: 1.13rem;
}