.introduction {
    margin-top: 50px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
}
.introduction_title {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}
.introduction_name {
    margin: 0 20px;
    font-size: 26px;
}
.xian {
    width: 100px;
    height: 1px;
    background-color: #cccccc;
}