* {
    margin: 0;
    padding: 0;
}

#app {
    width: 100%;
    height: 100vh;
}


/* banner */

.banner {
    width: 100%;
    height: 400px;
}


/* 内容区 */

#content {
    width: 1200px;
    /* background: #eee; */
    margin: auto;
}

.about_box {
    width: 1200px;
    height: 500px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    margin-bottom: 160px;
    overflow: hidden;
}

#content .about_txt {
    width: 1100px;
    height: 250px;
    /* height: 1000px; */
    margin: 69px auto 0;
}

#content .about_txt li {
    font-size: 18px;
    font-family: DFPSongW7-GB;
    font-weight: 400;
    color: #333333;
    line-height: 32px;
    margin-bottom: 40px;
}

#content .about_txt li span:nth-child(1) {
    width: 167px;
    height: 41px;
    font-size: 40px;
    font-family: DFPSongW9-GB;
    font-weight: 400;
    color: #3e7eff;
    line-height: 32px;
}