.idx_content .flex-direction-nav a, .product_bigclass .flex-direction-nav a {
    width: 80px;
    height: 150px;
    color: transparent;
    border-right: none;
}

.idx_content .flex-direction-nav a:before, .product_bigclass .flex-direction-nav a:before{
    font-size: 100px;
    color: rgb(255 238 0);
    text-shadow: 4px 2px 6px rgb(0 0 0 / 30%);
}