.banner {
    width: 70%;
    margin: 0px auto 30px;
    padding: 5% 0;
    display: flex;
    justify-content: center;
    background-image: url(../images/bann-bg.png);
    background-repeat: no-repeat;
    background-position: center bottom;
}

.ban-txt {
    text-align: center;
}

.ban-top {
    margin-bottom: 30px;
    font-size: 56px;
    font-weight: 700;
    font-family: '微软雅黑';
}

.ban-bot {
    font-size: 18px;
    font-family: '微软雅黑';
}

@media (max-width:999px) {
    .banner {
        width: 98%;
    }

    .ban-top {
        font-size: 30px;
    }

    .ban-bot {
        font-size: 19px;
        font-family: '微软雅黑';
    }

}