0c9faf04954e454e9d0c8bf883d60a087fe2a260
The page root Container's default 20px padding framed every AI-built section in a white margin (visible in every eval screenshot). New AI page/site replaces now set padding 0 on the page root unless the model set padding itself. Saved pages, section inserts, patches and the Container default are unchanged, so existing sites do not move. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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