WordPress/wp-content/themes/twentytwentyone/assets/sass/05-blocks/blocks.scss

// Blocks
// - These styles replace key Gutenberg Block styles with font, color, and
//   spacing with CSS-variables overrides
// - In the future the Block styles may get compiled to individual .css
//   files and conditionally loaded

@import "audio/style";
@import "button/style";
@import "code/style";
@import "columns/style";
@import "cover/style";
@import "file/style";
@import "gallery/style";
@import "group/style";
@import "heading/style";
@import "image/style";
@import "latest-comments/style";
@import "latest-posts/style";
@import "legacy/style"; // "Blocks" from the legacy WP editor, ie: galleries, .button class, etc.
@import "list/style";
@import "media-text/style";
@import "navigation/style";
@import "paragraph/style";
@import "preformatted/style";
@import "pullquote/style";
@import "query-loop/style";
@import "quote/style";
@import "rss/style";
@import "search/style";
@import "separator/style";
@import "social-icons/style";
@import "spacer/style";
@import "table/style";
@import "tag-clould/style";
@import "verse/style";
@import "video/style";
@import "utilities/font-sizes";
@import "utilities/style"; // Import LAST to cascade properly