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Semantic z-index values define stacking context purposes. They describe the purpose of each layer rather than arbitrary numbers:
  • base: Default layer (0)
  • raised: Slight elevation (1)
  • popup: Emerges from content, like dropdowns (200)
  • scrim: Blocks what’s beneath, like modal overlays (400)
  • floating: Above blocking layer, like content inside modals (500)

Example

See