.about_content {
    width: 80%;
    margin: 0 auto;
}

.about_content>div {
    display: flex;
    margin-bottom: 70px;
}

.about {
    width: 100%;
    margin-left: 0;
    border-bottom: 1px solid #cccccc;
}

.about span {
    display: inline-block;
    height: 45px;
    padding: 0 12px;
    line-height: 45px;
    border-bottom: 3px solid #c40000;
    font-size: 18px;
    color: #c40000;
}

.about_des {
    flex-grow: 1;
}

.about_des h3 {
    margin: 0;
    text-align: center;
    margin-left: 20px;
    font-size: 36px;
    line-height: 48px;
    font-weight: normal;
    color: rgb(118, 38, 13);
}

.about_des ul {
    margin-top: 70px;
    margin-left: 20px;
    list-style-type: none;
}

.about_des li {
    line-height: 35px;
    color: black;
    font-family: 宋体;
    font-size: 24px;
}
.about_des li:last-child {
    margin-top: 26px;
}