style.scss

// This variable is repeated across Button, Buttons, and Buttons editor styles.
$blocks-block__margin: 0.5em;

.wp-block-buttons {
	// This block has customizable padding, border-box makes that more predictable.
	box-sizing: border-box;

	&.is-vertical {
		flex-direction: column;
		> .wp-block-button {
			&:last-child {
				margin-bottom: 0;
			}
		}
	}

	// Increased specificity to override blocks default margin.
	> .wp-block-button {
		display: inline-block;
		margin: 0;
	}

	&.is-content-justification-left {
		justify-content: flex-start;
		&.is-vertical {
			align-items: flex-start;
		}
	}

	&.is-content-justification-center {
		justify-content: center;
		&.is-vertical {
			align-items: center;
		}
	}

	&.is-content-justification-right {
		justify-content: flex-end;

		&.is-vertical {
			align-items: flex-end;
		}
	}

	&.is-content-justification-space-between {
		justify-content: space-between;
	}

	// Kept for backward compatibility.
	&.aligncenter {
		text-align: center;
	}

	// Back compat: Inner button blocks previously had their own alignment
	// options. Forcing them to 100% width in the flex container replicates
	// that these were block level elements that took up the full width.
	//
	// This back compat rule is ignored if the user decides to use the
	// newer justification options on the button block, hence the :not.
	/* stylelint-disable @stylistic/indentation -- Disable the stylelint rule, otherwise this selector is ugly! */
	&:not(
		.is-content-justification-space-between,
		.is-content-justification-right,
		.is-content-justification-left,
		.is-content-justification-center
	) .wp-block-button.aligncenter {
	/* stylelint-enable @stylistic/indentation */
		margin-left: auto;
		margin-right: auto;
		width: 100%;
	}

	&[style*="text-decoration"] {
		.wp-block-button,
		.wp-block-button__link {
			text-decoration: inherit;
		}
	}

	&.has-custom-font-size {
		.wp-block-button__link {
			font-size: inherit;
		}
	}
}

// Legacy buttons that did not come in a wrapping container.
.wp-block-button.aligncenter {
	text-align: center;
}