.bb-product-gallery { position: relative; }
.gallery-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, .9);
    box-shadow: 0 1px 4px rgba(0, 0, 0, .2);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
}
.gallery-arrow-prev { left: 10px; }
.gallery-arrow-next { right: 10px; }