.main {
    width: 100%;
    height: auto;
    background: rgb(244, 244, 244);
    padding: 55px 0;
}
.about_box {
    display: flex;
    justify-content: space-between;
}
.about_box .about_box_nav {
    width: 239px;
    height: 819px;
    background: #FFFFFF;
}
.about_box .about_box_content {
    width: 940px;
    height: auto;
    background: #FFFFFF;
}
.about_box_nav ul {
    text-align: center;
}
.about_box_nav ul p {
    font-size: 20px;
    font-family: Microsoft YaHei;
    font-weight: bold;
    color: #B80311;
    line-height: 30px;
    text-align: center;
    margin-bottom: 35px;
    margin-top: 28px;
}
.about_box_nav ul li a {
    display: block;
    padding: 13px 0;
    margin-bottom: 18px;
    font-size: 16px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #666666;
}
.about_box_nav ul .active {
    color: #B80311;
background-image: linear-gradient(to right, #fef2f3,#fef8f8, #fffafa, #ffff);;
}

.about_box_content div {
    width: 880px;
    margin: 0 auto;
}
.about_box_content_t {
    margin-top: 30px !important;
    height: 60px;
    background: #F7F7F7;
    text-align: center;
    line-height: 60px;
    font-size: 22px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #333333;
}
.about_box_content_introduction{
    margin: 30px auto !important;
    box-sizing: border-box;
}
.about_box_content_img {
    margin-top: 20px !important;
    margin-bottom: 32px !important;
}
.about_box_content_introduction_t {
    font-size: 20px;
    font-family: Microsoft YaHei;
    font-weight: bold;
    color: #333333;
    line-height: 24px;
    margin-bottom: 30px;
}
/*.about_box_content_introduction p {*/
/*    margin: 30px 0;*/
/*}*/
.about_box_content_introduction_i {
    font-size: 14px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #333333;
    line-height: 24px;
    text-indent: 2em;
    margin: 30px 0;
}
.about_box_content_t_img_list {
    padding-top: 33px;
}
.about_box_content_t_img_list img {
    width: 290px;
    height: 159px;
    margin-bottom: 7px;
}

.cooperation_list {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding-top: 40px;
}
.cooperation_list div {
    width: 208px;
    height: 130px;
    background: #FFFFFF;
    border: 1px solid #EEEEEE;
    margin-bottom: 14px;

    display: flex;
    align-items: center;
    text-align: center;
}
.cooperation_list div img {
    vertical-align: middle;
    margin: 0 auto;
}


.about_box_content_list {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    margin-top: 48px;
}
.about_box_content_list li {
    width: 216px;
    height: 173px;
    /* background: #B80311; */
    /* box-shadow: 0px 0px 17px 1px rgba(225,225,225,0.52); */
    border-radius: 4px;
    margin-bottom: 24px;
    padding: 8px;
    box-sizing: border-box;
}

.about_box_content_list li.active {
    width: 216px;
    height: 173px;
    box-shadow: 0px 0px 17px 1px rgba(225,225,225,0.52);
    border-radius: 4px;
    margin-bottom: 24px;
}
.about_box_content_list li div {
    width: 201px;
    height: 129px;
    overflow: hidden;
}
.about_box_content_list li img {
    width: 201px;
    height: 129px;
    transition: all 0.5s;
    /* transform:none */
}
.about_box_content_list li img.active {
    transform: scale(1.1);
}
.about_box_content_list li p {
    margin-left: 8px;
    margin-top: 10px;
}
.about_box_content_list li p a {
    color: #666666;
}
.about_box_content_list li p a.active {
    color: #FFFFFFFF;
}

.big_div{
    text-align: center;
    margin: 0 auto;
}
.big_div img{
    width: 800px;
    height: 600px;
}