wp-calypso/apps/notifications/src/panel/boot/stylesheets/shared/buttons.scss

// ==========================================================================
// Buttons - From wp-calypso
// ==========================================================================

.wpnc__main {
	// resets button styles
	.wpnc__button {
		border: none;
		background: var(--color-surface);
		border-color: var(--color-neutral-10);
		border-style: solid;
		border-width: 1px 1px 2px;
		color: var(--color-neutral-70);
		cursor: pointer;
		display: block;
		outline: 0;
		overflow: hidden;
		font-weight: 500;
		text-align: center;
		text-overflow: ellipsis;
		text-decoration: none;
		vertical-align: top;
		box-sizing: border-box;
		font-size: 14px;
		line-height: 21px;
		border-radius: 4px;
		padding: 7px 14px 9px;
		-webkit-appearance: none;
		appearance: none;

		&:hover {
			border-color: var(--color-neutral-20);
			color: var(--color-neutral-70);
		}
		&:active {
			border-width: 2px 1px 1px;
		}
		&:visited {
			color: var(--color-neutral-70);
		}
		&[disabled],
		&:disabled {
			color: var(--color-neutral-0);
			background: var(--color-surface);
			border-color: var(--color-neutral-0);
			cursor: default;

			&:active {
				border-width: 1px 1px 2px;
			}
		}
		&:focus {
			border-color: var(--color-primary);
			box-shadow: 0 0 0 2px var(--color-primary-light);
		}
		&.is-compact {
			padding: 7px;
			color: var(--color-neutral-40);
			font-size: 11px;
			line-height: 1;
			text-transform: uppercase;

			&:disabled {
				color: var(--color-neutral-0);
			}
			.gridicon {
				top: 4px;
				margin-top: -8px;
			}
		}
		&.hidden {
			display: none;
		}
		.gridicon {
			position: relative;
			top: 4px;
			margin-top: -2px;
			width: 18px;
			height: 18px;
		}
	}
	// Primary buttons
	.wpnc__button.is-primary {
		background-color: var(--color-accent);
		border-color: var(--color-accent);
		color: var(--color-text-inverted);

		&:active:not(:disabled),
		&:hover:not(:disabled),
		&:focus:not(:disabled) {
			background-color: var(--color-accent-60);
			border-color: var(--color-accent-60);
			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-compact {
			color: var(--color-text-inverted);
		}

		&.is-rich {
			background-color: $wpnc__rich-blue;
			border-color: $wpnc__rich-blue;

			&:active:not(:disabled),
			&:hover:not(:disabled),
			&:focus:not(:disabled) {
				background-color: $wpnc__dark-rich-blue;
				border-color: $wpnc__dark-rich-blue;
			}
		}
	}

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

		&:hover,
		&:focus {
			border-color: var(--color-error);
		}
		&:focus {
			box-shadow: 0 0 0 2px var(--color-error-20);
		}
		&[disabled],
		&:disabled {
			color: var(--color-error-5);
			border-color: var(--color-neutral-0);
		}
	}

	.wpnc__button.is-primary.is-scary {
		background: var(--color-error);
		border-color: var(--color-error-60);
		color: var(--color-text-inverted);

		&:hover,
		&:focus {
			border-color: var(--color-error-100);
		}
		&[disabled],
		&:disabled {
			background: var(--color-error-20);
			border-color: var(--color-error-30);
		}
	}

	.wpnc__button.is-borderless {
		border: none;
		color: var(--color-neutral-40);
		padding-left: 0;
		padding-right: 0;

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

		&:focus {
			box-shadow: none;
		}

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

		&[disabled],
		&:disabled {
			color: var(--color-neutral-0);
			background: var(--color-surface);
			cursor: default;

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

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

			&[disabled] {
				color: var(--color-error-5);
			}
		}

		&.is-compact {
			background: transparent;
			border-radius: 0;
			.gridicon {
				width: 18px;
				height: 18px;
				top: 5px;
			}
		}
	}
}