Fix dark-mode contrast in the layout component demos

FA
30m ago
+85-5

Type of change

  • Bug fix (non-breaking change which fixes an issue)

Description

The stack, box, spacer and aspect ratio demos use fixed light CSS background colors (orange, lightblue, papayawhip, ...) but inherit the theme text color, so in dark mode their labels rendered near-white on pastel boxes. This pins color="black" on those boxes so they read in both themes.

https://claude.ai/code/session_01LwJUCUDZhZY71q8Azr37BQ

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