wp-calypso/packages/components/src/button/style.scss

// ==========================================================================
// Buttons
// ==========================================================================
@import "../styles/typography";

.button {
	font-family: $a8c-font-family-sans;
	background: transparent;
	border-style: solid;
	border-width: 1px;
	cursor: pointer;
	display: inline-block;
	margin: 0;
	outline: 0;
	overflow: hidden;
	text-align: center;
	text-overflow: ellipsis;
	text-decoration: none;
	vertical-align: top;
	box-sizing: border-box;
	font-size: $font-body-small;
	line-height: 22px;
	border-radius: 2px;
	padding: 8px 14px;
	appearance: none;


	.rtl & {
		font-family: $a8c-font-family-sans-rtl;
	}

	&.hidden {
		display: none;
	}

	.gridicon {
		position: relative;
		top: 4px;
		margin-top: -2px;
		width: 18px;
		height: 18px;

		&:not(:last-child) {
			margin-right: 4px;
		}
	}

	&:active,
	&.is-active {
		border-width: 1px;
	}

	background-color: var(--color-surface);
	color: var(--color-neutral-70);
	border-color: var(--color-neutral-10);

	&:hover {
		border-color: var(--color-neutral-20);
		color: var(--color-neutral-70);
	}

	&:visited {
		color: var(--color-neutral-70);
	}

	&[disabled],
	&:disabled,
	&.disabled {
		color: var(--color-neutral-20);
		background-color: var(--color-surface);
		border-color: var(--color-neutral-5);
		cursor: default;

		&:active,
		&.is-active {
			border-width: 1px;
		}
	}

	.accessible-focus &:focus {
		border-color: var(--color-primary);
		box-shadow: 0 0 0 2px var(--color-primary-light);
	}

	&.is-compact {
		padding: 7px;
		color: var(--color-text-subtle);
		font-size: $font-body-extra-small;
		line-height: 1;

		&:disabled {
			color: var(--color-neutral-20);
		}
		.gridicon {
			top: 5px;
			margin-top: -8px;
		}
		// Make the left margin of the small plus icon visually less huge
		.gridicons-plus-small {
			margin-left: -4px;
		}
		// Reset the left margin if the button contains only the plus icon
		.gridicons-plus-small:last-of-type {
			margin-left: 0;
		}
		// Make plus icon nudged closer to adjacent icons for add-people and add-plugin type buttons
		.gridicons-plus-small + .gridicon {
			margin-left: -4px;
		}
	}

	&.is-busy {
		pointer-events: none;
		animation: button__busy-animation 3000ms infinite linear;
		background-size: 120px 100%;
		background-image: linear-gradient(-45deg, var(--color-neutral-10) 28%, var(--studio-gray-5) 28%, var(--studio-gray-5) 72%, var(--color-neutral-10) 72%);
	}

	&.dashicons {
		/* stylelint-disable-next-line font-family-no-missing-generic-family-keyword */
		font-family: dashicons;
	}
}

// Primary buttons
.button.is-primary {
	background-color: var(--color-accent);
	border-color: var(--color-accent);
	color: var(--color-text-inverted);

	&:hover,
	&:focus {
		background-color: var(--color-accent-60);
		border-color: var(--color-accent-60);
		color: var(--color-text-inverted);
	}

	.accessible-focus &:focus {
		box-shadow: 0 0 0 2px var(--color-accent-light);
	}

	&.is-compact {
		color: var(--color-text-inverted);
	}

	&[disabled],
	&:disabled,
	&.disabled {
		color: var(--color-neutral-20);
		background-color: var(--color-surface);
		border-color: var(--color-neutral-5);
	}

	&.is-busy {
		background-image: linear-gradient(-45deg, var(--color-accent) 28%, var(--color-accent-60) 28%, var(--color-accent-60) 72%, var(--color-accent) 72%);
	}
}

// Scary buttons
.button.is-scary {
	color: var(--color-error);

	&:hover,
	&:focus {
		border-color: var(--color-error);
	}

	.accessible-focus &:focus {
		box-shadow: 0 0 0 2px var(--color-error-light);
	}

	&[disabled],
	&:disabled {
		color: var(--color-neutral-20);
		background-color: var(--color-surface);
		border-color: var(--color-neutral-5);
	}
}

.button.is-primary.is-scary {
	background-color: var(--color-error);
	border-color: var(--color-error);
	color: var(--color-text-inverted);

	&:hover,
	&:focus {
		background-color: var(--color-error-60);
		border-color: var(--color-error-60);
	}

	&[disabled],
	&:disabled {
		color: var(--color-neutral-20);
		background-color: var(--color-surface);
		border-color: var(--color-neutral-5);
	}

	&.is-busy {
		background-image: linear-gradient(-45deg, var(--color-error) 28%, var(--color-error-60) 28%, var(--color-error-60) 72%, var(--color-error) 72%);
	}
}

.button.is-borderless {
	border: none;
	background: none;
	color: var(--color-text-subtle);
	padding-left: 0;
	padding-right: 0;

	&:hover,
	&:focus {
		background: none;
		color: var(--color-neutral-70);
	}

	.gridicon {
		width: 24px;
		height: 24px;
		top: 6px;
	}

	&[disabled],
	&:disabled {
		color: var(--color-neutral-20);
		cursor: default;

		&:active,
		&.is-active {
			border-width: 0;
		}
	}
	&.is-scary {
		color: var(--color-error);

		&:hover,
		&:focus {
			color: var(--color-error-60);
		}

		&[disabled] {
			color: var(--color-error-20);
		}
	}

	&.is-primary {
		color: var(--color-accent);

		&:focus,
		&:hover,
		&:active,
		&.is-active {
			color: var(--color-accent-dark);
		}

		&:focus {
			box-shadow: 0 0 0 2px var(--color-accent-light);
		}

		&[disabled] {
			color: var(--color-neutral-20);
		}
	}

	&.is-compact {
		.gridicon {
			width: 18px;
			height: 18px;
			top: 5px;
		}

		//arrows sit 1px low in their svg bounding box, need a nudge
		.gridicons-arrow-left {
			top: 4px;
			margin-right: 4px;
		}

		.gridicons-arrow-right {
			top: 4px;
			margin-left: 4px;
		}
	}
}

.button-plain {
	appearance: none;
	background: transparent;
	color: inherit;
	border: none;
	font-size: inherit;
	font-weight: inherit;
	outline: 0;
	padding: 0;
	vertical-align: baseline;
}

.button.is-transparent {
	background: transparent;
	border-color: var(--transparent-button-text-color, currentcolor);
	display: flex;
	justify-content: center;

	&,
	&:visited {
		color: var(--transparent-button-text-color, currentcolor);
	}

	&:hover {
		border-color: var(--transparent-button-text-color-hover, var(--color-accent));
		color: var(--transparent-button-text-color-hover, var(--color-accent));
		background: transparent;
	}
}


// ==========================================================================
// Deprecated styles
// ==========================================================================

.button.is-link {
	background: transparent;
	border: none;
	border-radius: 0;
	padding: 0;
	color: var(--color-link);
	font-weight: 400;
	font-size: inherit;
	line-height: 1.65;

	&:hover,
	&:focus,
	&:active,
	&.is-active {
		color: var(--color-link-dark);
		box-shadow: none;
	}
}

@keyframes button__busy-animation {
	0% {
		background-position: 240px 0;
	}
}