index.css

.content {
    margin-top: 120px;
    color: #202020;
    text-align: center;
}

.content .title {
    font-size: 40px;
    font-weight: bold;
}

.content .subtitle {
    font-size: 20px;
    line-height: 1.5;
    margin: 40px auto;
}

@media (max-width: 768px) {
    .content {
        margin-top: 70px;
    }

    .content .title {
        font-size: 23px;
        max-width: 85%;
        margin: 0 auto;
        line-height: 36px;
    }

    .content .subtitle {
        margin: 23px auto 46px;
        font-size: 15px;
        line-height: 24px;
        max-width: 90%;
        text-align: left;
        text-align: center;
    }
}

.secthree {
    position: relative;
}

.secthree .mainbox {
    width: 70%;
    max-width: 1000px;
    margin: 20px auto;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.secthree .mainbox .left,
.secthree .mainbox .right {
    width: 48px;
    height: 48px;
    line-height: 48px;
    text-align: center;
    font-size: 25px;
    border-radius: 50%;
    background-color: #ffe525;
}

.secthree .mainbox .left img,
.secthree .mainbox .right img {
    width: 16px;
    height: 16px;
}

.secthree .mainbox .left:hover,
.secthree .mainbox .right:hover {
    background-color: #ffb600;
}

.secthree .mainbox .left img {
    transform: rotate(180deg);
}

.secthree .mainbox .imgbox {
    width: 80%;
}

.secthree .mainbox .imgbox img {
    width: 100%;
}

.secthree .mainbox .imgbox .demo1 {
    position: relative;
    width: 100%;
}

.secthree .mainbox .imgbox .container {
    position: relative;
    /* width: 100%; */
    height: 380px;
    overflow: hidden;
    transform: translate3d(0, 0, 0);
}

.secthree .mainbox .imgbox .container .cards_list {
    width: 600px;
    background-color: #f4f4f4;
    overflow: hidden;
}

.secthree .mainbox .imgbox .container .cards_list .img img {
    display: block;
    width: 600px;
}

.secthree .itembox {
    width: 70%;
    margin: 50px auto 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.secthree .itembox .item {
    width: 150px;
    background: white;
    box-shadow: 0 10px 10px rgba(0, 0, 0, 0.2);
    padding-bottom: 4px;
}

.secthree .itembox .item.active {
    padding-bottom: 0;
    border-bottom: 4px solid #FFE528;
}

.secthree .itembox .item:not(:first-child) {
    margin-left: 30px;
}

.secthree .itembox .img {
    width: 60px;
    height: 60px;
    line-height: 60px;
    margin: -30px auto 0;
    border-radius: 50%;
    background: #fdf6d6;
}

.secthree .itembox .img img {
    width: 35px;
    vertical-align: middle;
}

.secthree .itembox .name {
    margin: 20px 0;
    white-space: nowrap;
}

.secthree .difbox:not(:first-child) {
    display: none;
}

@media (max-width: 768px) {

    .secthree .mainbox {
        width: 90%;
        margin: 20px auto 0;
    }

    .secthree .mainbox .left,
    .secthree .mainbox .right {
        display: none !important;
    }

    .secthree .mainbox .imgbox {
        width: 100%;
    }

    .secthree .mainbox .imgbox img {
        width: 100%;
    }

    .secthree .mainbox .imgbox .container {
        width: 100%;
        height: 200px;
    }

    .secthree .mainbox .imgbox .container .cards_list {
        width: 277px !important;
    }

    .secthree .mainbox .imgbox .container .cards_list .img img {
        width: 100%;
    }

    .secthree .itembox {
        width: 96%;
        flex-wrap: wrap;
        margin: 0 auto;
        justify-content: space-evenly;
    }

    .secthree .itembox .item {
        width: 107px;
        margin-left: 0px !important;
        margin-top: 58px;
    }

    .secthree .itembox .item .img {
        width: 50px;
        height: 50px;
        line-height: 50px;
        margin: -18px auto 0;
    }

    .secthree .itembox .item .img img {
        width: 28px;
    }

    .secthree .itembox .item .name {
        font-size: 15px;
    }
}