.wp-block-image { /* From what I can tell the below are styles regularly used by themes to fix the image block. I believe these should go into the block's default styles. It's difficult to say how this will land, however based on discussion found in (many) related issues here: https://github.com/WordPress/gutenberg/issues/28923 https://github.com/WordPress/gutenberg/issues/29506 */ text-align: center; }