website/sass/component/image-comparison.scss

.image-comparison {
	position: relative;
	touch-action: pan-y pinch-zoom;
	max-width: Min(100%, 512px);

	.crop-container {
		height: 100%;

		&:nth-child(2) {
			overflow: hidden;
			width: calc(100% - var(--comparison-percent));

			&,
			img {
				position: absolute;
				top: 0;
				right: 0;
			}
		}

		&.crop-container.crop-container {
			img {
				display: block;
				width: auto;
				height: 100%;
			}

			&:first-child img {
				width: 100%;
			}
		}
	}

	.slide-bar {
		position: absolute;
		background: var(--color-navy);
		margin-left: -2px;
		width: 4px;
		height: 100%;
		top: 0;
		left: var(--comparison-percent);
		box-shadow: 0 0 2px rgba(255, 255, 255, 0.5);

		.arrows {
			position: absolute;
			top: calc(50% - (40px / 2));
			left: calc(4px / 2);
			width: 0;
			height: 0;
			opacity: 1;
			transition: opacity 0.25s;

			svg {
				position: absolute;
				width: 6.5px;
				height: 11px;
				top: calc(-11px / 2);
				fill: white;

				@keyframes pulse-left {
					from { transform: translateX(3px); }
					to { transform: translateX(-3px); }
				}

				@keyframes pulse-right {
					from { transform: scaleX(-1) translateX(3px); }
					to { transform: scaleX(-1) translateX(-3px); }
				}

				@keyframes pulse-opacity {
					0% { opacity: 0; }
					40% { opacity: 1; }
					90% { opacity: 1; }
					100% { opacity: 0; }
				}

				&:nth-of-type(1) {
					right: 6px;
					animation: 3s infinite ease-out pulse-left, 3s infinite ease-out pulse-opacity;
				}

				&:nth-of-type(2) {
					left: 6px;
					animation: 3s infinite ease-out pulse-right, 3s infinite ease-out pulse-opacity;
				}
			}

			div {
				content: "";
				position: absolute;
				background: var(--color-navy);
				top: 0;
				left: 0;
				width: 32px;
				height: 32px;
				transform: translate(-50%, -50%) rotate(45deg);
				box-shadow: 0 0 2px rgba(255, 255, 255, 0.5);
			}

			// Cover up the box-shadow at the top and bottom of the circle so it connects to the vertical line
			&::after {
				content: "";
				position: absolute;
				background: var(--color-navy);
				left: -2px;
				top: -24px;
				width: 4px;
				height: 48px;
			}
		}
	}

	&:hover .slide-bar .arrows {
		opacity: 0;
	}
}