.flex-container {
    display: flex;
    flex-wrap: nowrap;
    background-color: #ffffff;
}

.flex-container > div {
    background-color: #f1f1f1;
    margin: 10px;
    text-align: center;
}
.woocommerce div.product div.images .woocommerce-product-gallery__image--placeholder {
    border: 10px solid #dce64c;
}