#upperLimit {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4.38rem;
    height: 1.99rem;
    background: url(../images/upperLimitBg.png)no-repeat center/100%;
    font-size: 0.32rem;
    color: #000;
    text-align: center;
}