fix: center slides better for iframed content

[mscolnick]

Fixes #6463

• Slides are centered better for iframe content

  /* If the first output is the only child, make it flex 1 */
  > *:only-child > .output:only-child {
    flex: 1;
  }

• Better bottom padding when content overflows

min-height: fit-content;

• Use more real-estate when slides is not in full screen:

return <div className="pr-18 pb-5 flex-1 flex flex-col">{slides}</div>;

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Sep 22, 2025 2:24pm