.product-details__select-size .select-box select, .cart-page__shipping-input-box .select-box select, .product__showing-sort .select-box select{
    background-color: rgba(var(--mediplace-base-rgb), .10);
    color: var(--mediplace-gray);
    font-size: 15px;
    font-weight: 400;
    height: 40px;
    padding: 0 40px 0 20px;
    border-radius: 8px;
    border: 1px solid #ddd;
    width: 100%;
    appearance: none;          /* ⭐ removes default arrow */
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
}

/* Custom arrow */
.product-details__select-size .select-box, .cart-page__shipping-input-box .select-box, .product__showing-sort .select-box {
    position: relative;
    display: inline-block;
}

.product-details__select-size .select-box::after, .cart-page__shipping-input-box .select-box::after, .product__showing-sort .select-box::after {
    content: "▼";
    font-size: 12px;
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: #555;
}