.add {
    max-width: 1440px;
    display: flex;
    /* 推荐方案：弹性布局 */
    justify-content: space-between;
    margin: 0 auto;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 30px;
    overflow: hidden;
    /* 统一设置行间距和列间距 */
}



.science {
    background: url(../picture/dbg.jpg) no-repeat;
    background-size: cover;
}

@media (max-width: 767px) {

    .chyg-img-list .swiper-button-prev,
    .chyg-img-list .swiper-button-next {
        display: none;
    }
}

.qita {
    background-color: #f8f8f8;
}