.Box3 {
    padding: 50px 0;
    background-image: url('../img/about/lsbj.png');
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
}

.Box3 .container-md {
    position: relative;
}

.Box3 .left,
.Box3 .right {
    position: absolute;
    background-color: transparent;
    border: none;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border: 2px solid #428CCC;
    color: #428CCC;
    border-radius: 99px;
    font-size: 20px;
    font-weight: 600;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.3s;
}

.Box3 .left:hover,
.Box3 .right:hover {
    color: #045297;
    border: 2px solid #045297;
}

.Box3 .left {
    left: 0;
    transform: translateY(-50%) rotate(180deg);
}

.Box3 .right {
    right: 0;

}

.Box3 p {
    margin: 0;
}


.Box3 .slick-list {
    height: fit-content;
    padding: 50px 0;
}

.Box3 .slick-track {
    padding: 0;
}

.Box3 .lb {
    width: 90%;
    margin: 0 auto;
    position: relative;
}

.Box3 .lb .slick-prev,
.Box3 .lb .slick-next {
    display: none !important;
}

.Box3 .lb::before {
    position: absolute;
    content: '';
    width: 100%;
    height: 3px;
    background-color: #BFBFBF;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
}

.Box3 .lb .box {
    position: relative;
    padding-top: 23%;

}

.Box3 .lb .box .text {
    padding: 20px;
    background-color: #428CCC;
    color: white;
    position: absolute;
    /* 关键修改：中心偏下3% */
    top: 50%;
    /* 先定位到垂直中心 */
    transform: translateY(20%);
    height: fit-content;
    border-radius: 10px;
}

.Box3 .lb .box:hover .text {
    background-color: #2184da;
}

.Box3 .lb .box:nth-child(2n) .text {
    transform: translateY(-120%);
}

.Box3 .lb .box .text span {
    width: 0;
    height: 0;
    border-width: 0 15px 15px;
    border-style: solid;
    border-color: transparent transparent #428CCC;
    position: absolute;
    top: -14px;
    left: 50%;
    margin-left: -15px;
}

.Box3 .lb .box:nth-child(2n) .text span {
    width: 0;
    height: 0;
    border-width: 15px 15px 0;
    border-style: solid;
    border-color: #428CCC transparent transparent;
    position: absolute;
    bottom: -14px;
    left: 50%;
    /* transform: translateX(-50%); */
    top: auto;
}

.Box3 .lb .box .text h2 {
    font-size: 24px;
}

.Box3 .lb .box .text p {
    font-size: 15px;
    text-transform: capitalize;
}

.Box3 .lb .box .img {
    position: absolute;
    background-image: url(../img/about/history-li.png);
    background-position: left center;
    width: 30px;
    height: 30px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.Box3 .lb .box:hover .img {
    background-position: right center;
}

.Box4 {
    display: none;
    position: relative;
   
}
.Box4::before{
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: url(https://img.freepik.com/premium-photo/painting-water-droplet-corner_1103001-1302.jpg);
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    z-index: -1;
    opacity: 0.35;
}
.Box4 .timelineMajor {
    margin-bottom: 20px;
}
.Box4 .timelineMajor h2 span {
    font-size: 35px;
}

.Box4 a:not([href]):not([class]),
.Box4 a:not([href]):not([class]):hover {
    font-size: 18px;
}
.Box4 .timelineMinor dt a{
    color: #333;
    transition: 0.4s;
}
.Box4 .timelineMinor dt a:hover {
    color: #428CCC;
}

.Box4 .timelineEvent p {
    font-size: 14px;
    color: #545454;
    margin-top: 10px;
    text-transform: capitalize;
}
 .Box4 .container{
    padding: 0;
 }
 .Box4 #timelineContainer{ 
    border-left: 2px solid #428CCC;
 }
 .Box4 #timelineContainer h2{
    padding-left: 20px;
    background: url(/templets/SiGaoMei/static/img/image.png) left center no-repeat;
 }
  .Box4 #timelineContainer .timelineMinor{
    padding-left: 20px;
  }
@media screen and (max-width:1650px) {
    .Box3 .lb .box {
        padding-top: 30%;
    }
}

@media screen and (max-width:1200px) {
    .Box3 .lb .box .text {
        padding: 12px;
    }

    .Box3 .lb .box {
        padding-top: 33%;
    }




}

@media screen and (max-width:1200px) {

    .Box3 .lb .box {
        padding-top: 30%;
    }
}

@media screen and (max-width:670px) {
    .Box3{
        padding: 20px 0;
    }
    .Box3 .lb .box {
        padding-top: 0;
        padding: 0 10px;
    }

    .Box3 .lb .box .text {
        position: relative;
    }

    .Box3 .lb::before {
        top: 30px;
    }

    .Box3 .slick-list {
        padding: 0;
        /* overflow: visible; */
        padding: 30px 0 60px 0;
    }

    .Box3 .left,
    .Box3 .right {
        top: 30px;
    }

    .Box3 .lb .box .img {
        top: 0;
    }

    .Box3 .lb .box:nth-child(2n) .text {
        transform: translateY(20%);
    }

    .Box3 .lb .box:nth-child(2n) .text span {
        width: 0;
        height: 0;
        border-width: 0 15px 15px;
        border-style: solid;
        border-color: transparent transparent #428CCC;
        position: absolute;
        top: -14px;
        left: 50%;
        margin-left: -15px;
    }
}

@media screen and (max-width:576px) {
    .Box3 {
        display: none;
    }

    .Box4 {
        padding: 35px 0;
        display: block;
    }
}