.back {
    position: fixed;
    left: 0;
    width: 60rpx;
    padding-left: 30rpx;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99;
}

.title {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    z-index: 99;
    font-size: 32rpx;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
}