.co_bf {
    width: 100%;
    overflow: hidden;
    margin-top: 30px;
}

.coa_t {
    width: 100%;
}

.coa_t img {
    width: 100%;
    display: block;
}

.coa_b {
    overflow: hidden;
    margin: 55px 0;
}

.coab_l {
    width: 145px;
    float: left;
}

.coab_l dd {
    font-size: 30px;
    color: #070403;
    margin-top: 20px;
}

.coab_r {
    width: 980px;
    float: right;
}

.coab_r p {
    font-size: 16px;
    color: #707070;
    line-height: 32px;
    margin-bottom: 25px;
}

.cob_t {
    width: 126px;
    height: 33px;
    text-align: center;
    line-height: 33px;
    font-size: 18px;
    color: #393939;
    border: 1px solid #67777d;
    margin: 0 auto;
}

.cob_b {
    width: 1200px;
    overflow: hidden;
    position: relative;
    margin: 0 auto;
    padding-top: 85px;
    margin-bottom: 90px;
}

.cob_b::before {
    width: 1px;
    height: 100%;
    background-color: #67777d;
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
}

.cob_b li {
    width: 571px;
    margin-bottom: 80px;
    position: relative;
}

.cob_b li b {
    width: 22px;
    height: 22px;
    display: block;
    /* background-color: #135d7a;*/
    border-radius: 50%;
    position: absolute;
    left: -9px;
    top: 10px;
    background-image: url(../images/history-icon.png);
    background-repeat: no-repeat;
}

.cob_b li:nth-child(even) b {
    left: auto;
    right: -10px;
}

.cob_b li:nth-child(odd) {
    padding-left: 30px;
    float: right;
}

.cob_b li:nth-child(even) {
    padding-right: 30px;
    float: left;
    text-align: right;
}

.cob_b li em {
    display: block;
    font-size: 36px;
    color: #1f1f1f;
    font-weight: bold;
}


.cob_b li p {
    font-size: 20px;
    color: #1f1f1f;
    line-height: 35px;
    margin-bottom: 20px;
}