Clarify z-1 validity in Tailwind CSS v4#3
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Clarify z-1 validity in Tailwind CSS v4
Feb 26, 2026
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A review comment flagged
z-1innavigation-menu.tsxas invalid since it's not in Tailwind v3's default z-index scale. This project uses Tailwind v4 (^4.1.18), where bracket-less numeric utilities are natively supported.Changes
z-1is correct for Tailwind v4 and generatesz-index: 1as intendedz-1is valid in v4, distinguishing it from v3 behavior wherez-[1](arbitrary value syntax) would have been required💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.