.swiper-container > .el-gallery-wrapper .el-gallery-item .bh-image-background {
    background-position: center center;
    background-size: cover;
}

.el-gallery-thumbnail-container {
    display: -ms-grid;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    grid-gap: 10px;
}
.el-gallery-thumbnail-container .el-gallery-item {
    display: block;
    position: relative;
    height: 0;
    padding-top: 100%;
}
.el-gallery-thumbnail-container .el-gallery-item .bh-image-background {
    height: 100%;
    width: 100%;
    left: 0;
    top: 0;
    position: absolute;
    background-position: center center;
    background-size: cover;
}