.custom-product-slider {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.custom-product-slider .slider-main {
    display: flex;
    width: 85%;
}
.custom-product-slider .slider-thumbnails {
    width: 15%;
}

.custom-product-slider .slide img {
    width: 100%;
}