.intro_top_box {
    display: flex;
    margin-right: 74px;
    flex-flow: column;
    justify-content: space-between;
    height: 100%;
    align-items: flex-start;
}
.intro_bottom_box {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}
.intro_bottom_box img {
    width: 32%;
}
.history_list {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.history_list .line_box {
    padding: 0 130px;
    margin-bottom: 200px;
}
.history_item {
    width: 550px;
    margin-bottom: 150px;
}
.history_item .item_title {
    font-size: 36px;
    padding-bottom: 20px;
    border-bottom: 1px solid #DDDDDD;
    color: #333;
}
.history_item p {
    color: #777;
    padding: 30px 40px;
}
.left {
    text-align: left;
}
.right {
    text-align: right;
}

.part_list {
    display: flex;
    flex-wrap: wrap;
    margin-top: 20px;
}
.part_list .part_item_box {
    width: 25%;
    height: 300px;
    background-color: #F3F5F7;
    position: relative;
}
.part_list .part_item_box img {
    user-select: none;
    pointer-events: none;
}
.part_item_box .part_item_info {
    position: absolute;
    top: 124px;
    left: 124px;
    display: flex;
}
.part_item_box .part_item_info .part_block {
    width: 30px;
    height: 30px;
    background-color: #2AC2A7;
    margin-right: 30px;
}
.color666 {
    color: #666;
}