mediawiki-skins-Citizen/resources/skins.citizen.styles/components/OverflowElements.less

@overflow-affordnance-size: 2rem;

.mask-gradient(@direction, @color1, @color2, @color3: null, @color4: null) {
	-webkit-mask-image: linear-gradient( @direction, @color1, @color2 );
	mask-image: linear-gradient( @direction, @color1, @color2 );

	& when not(@color3 =null),
	not(@color4 =null) {
		-webkit-mask-image: linear-gradient( @direction, @color1, @color2, @color3, @color4 );
		mask-image: linear-gradient( @direction, @color1, @color2, @color3, @color4 );
	}
}

.hideOverflowButton() {
	pointer-events: none;
	visibility: hidden;
}

.showOverflowButton() {
	z-index: 1;
	pointer-events: auto;
	visibility: visible;
}

// Elements enhanced by overflowElements.js
.citizen-overflow {
	&-wrapper {
		position: relative;
	}

	&-content {
		overflow-x: auto;

		.wikitable {
			display: table;
			max-width: none;
			overflow: initial;
		}

		.citizen-overflow--left > & {
			.mask-gradient(90deg, transparent, #000 @overflow-affordnance-size);
		}

		.citizen-overflow--right > & {
			.mask-gradient(270deg, transparent, #000 @overflow-affordnance-size);
		}

		.citizen-overflow--left.citizen-overflow--right > & {
			.mask-gradient(90deg, transparent, #000 @overflow-affordnance-size, #000 ~'calc( 100% - @{overflow-affordnance-size} )', transparent);
		}
	}

	&-nav {
		position: absolute;
		inset: 0;
		display: flex;
		justify-content: space-between;
	}

	&-navButton {
		width: @overflow-affordnance-size;
		height: 100%;
		padding: 0;
		appearance: none;
		cursor: pointer;
		background: transparent;
		border: 0;
		border-radius: var( --border-radius--small );
		display: flex;
		align-items: center;
		justify-content: center;
		.hideOverflowButton();

		&::before {
			width: 1.25rem;
		}

		&-left {
			.citizen-overflow--left & {
				.showOverflowButton();
			}

			&::before {
				transform: rotate( -90deg );
			}
		}

		&-right {
			.citizen-overflow--right & {
				.showOverflowButton();
			}

			&::before {
				transform: rotate( 90deg );
			}
		}

		&:hover {
			background-color: var( --background-color-quiet--hover );
		}

		&:active {
			background-color: var( --background-color-quiet--active );
		}
	}
}

.citizen-animations-ready .citizen-overflow-content {
	scroll-behavior: smooth;
}