Never lose a z-index battle again
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CSS's `calc()` function supports the `infinity` keyword, which gets clamped to the maximum allowed value for a given property. For `z-index`, this means `calc(infinity)` resolves to 2147483647 — the largest possible signed 32-bit integer value. This provides a readable, intent-clear way to ensure an element sits at the top of the z-axis without hardcoding the magic number. The post also clarifies that `calc(infinity + 1)` doesn't go higher, since the value is already at the 32-bit integer ceiling.
