themes-wordpress/blockbase/sass/base/_alignment.scss

@include break-mobile {
	// limit size of any element that is aligned left/right
	.wp-block[data-align="left"], // This is for the editor
	.wp-block[data-align="right"], // This is for the editor
	.wp-site-blocks .alignleft,
	.wp-site-blocks .alignright {
		max-width: var(--wp--custom--alignment--aligned-max-width);
	}
}

// This was added for the 'site-logo' block which centers with an 'align:center' attribute
// instead of 'textAlign' center which sets an .aligncenter class instead of a has-text-align-center
// class which would do this for us.  I'm not sure why but this centers things appropriately.
// Display and margin properties added to support image alignment from the classic editor.
.aligncenter {
	text-align: center;
	display: block;
	margin-right: auto;
	margin-left: auto;
}


/*
 * Alignment styles - from TT2
 * These rules are temporary, and should not be relied on or
 * modified too heavily by themes or plugins that build on
 * Twenty Twenty-Two. These are meant to be a precursor to
 * a global solution provided by the Block Editor.
 *
 * Relevant issues:
 * https://github.com/WordPress/gutenberg/issues/35607
 * https://github.com/WordPress/gutenberg/issues/35884
 */

.wp-site-blocks,
body > .is-root-container,
.edit-post-visual-editor__post-title-wrapper,
.wp-block-group.alignfull,
.wp-block-group.has-background,
.wp-block-columns.alignfull.has-background,
.wp-block-cover.alignfull,
.is-root-container .wp-block[data-align="full"] > .wp-block-group,
.is-root-container .wp-block[data-align="full"] > .wp-block-columns.has-background,
.is-root-container .wp-block[data-align="full"] > .wp-block-cover {
	padding-left: var(--wp--custom--gap--horizontal);
	padding-right: var(--wp--custom--gap--horizontal);
}

.wp-site-blocks .alignfull,
.wp-site-blocks > .wp-block-group.has-background,
.wp-site-blocks > .wp-block-cover,
.wp-site-blocks > .wp-block-template-part > .wp-block-group.has-background,
.wp-site-blocks > .wp-block-template-part > .wp-block-cover,
body > .is-root-container > .wp-block-cover,
body > .is-root-container > .wp-block-template-part > .wp-block-group.has-background,
body > .is-root-container > .wp-block-template-part > .wp-block-cover,
.is-root-container .wp-block[data-align="full"] {
	margin-left: calc(-1 * var(--wp--custom--gap--horizontal)) !important;
	margin-right: calc(-1 * var(--wp--custom--gap--horizontal)) !important;
	max-width: unset;
	width: unset;
}

/* Blocks inside columns don't have negative margins. */
.wp-site-blocks .wp-block-columns .wp-block-column .alignfull,
.is-root-container .wp-block-columns .wp-block-column .wp-block[data-align="full"],
.wp-site-blocks .alignfull:not(.wp-block-group) .alignfull,
.is-root-container .wp-block[data-align="full"] > *:not(.wp-block-group) .wp-block[data-align="full"] {
	margin-left: auto !important;
	margin-right: auto !important;
	width: inherit;
}

/* Spacing for group blocks with a background color. */
.wp-block-group.has-background {
	padding: var(--wp--custom--gap--vertical) var(--wp--custom--gap--horizontal);
}