_s/sass/shop/_single-product.scss

.single-product {

	div.product {
		position: relative;

		.woocommerce-product-gallery {
			position: relative;
			float: left;

			.woocommerce-product-gallery__trigger {
				position: absolute;
				top: 2em;
				right: 1em;
				display: block;
				z-index: 99;
			}

			.flex-viewport {
				margin-bottom: 1em;
			}

			.flex-control-thumbs {
				margin: 0;
				padding: 0;

				li {
					list-style: none;
					cursor: pointer;
					float: left;

					img {
						opacity: 0.5;

						&.flex-active {
							opacity: 1;
						}
					}

					&:hover {

						img {
							opacity: 1;
						}
					}
				}
			}

			@for $i from 2 through 5 {

				&.woocommerce-product-gallery--columns-#{$i} {

					.flex-control-thumbs {

						li {

							@include column-width($i);

							&:nth-child(#{$i}n) {
								margin-right: 0;
							}

							&:nth-child(#{$i}n+1) {
								clear: both;
							}
						}
					}
				}
			}
		}
	}
}

.stock {

	&:empty::before {
		display: none;
	}

	&.in-stock {
		color: $woocommerce__color-success;
	}

	&.out-of-stock {
		color: $woocommerce__color-error;
	}
}