.top {
    float: left;
    width: 100%;

    .left {
        float: left;
        width: 15%;
        text-align: center;
        overflow: hidden;

        .back {
            width: 40rpx;
            height: 40rpx;
            position: relative;
            left: 15px;
            width: 40rpx;
            height: 40rpx;
        }
    }

    .cen {
        float: left;
        width: 70%;
        text-align: center;
        font-size: 36rpx;
        color: #000000;
        font-weight: 600;
    }

    .right {
        float: left;
        width: 15%;
    }
}