CSS Math Units
SkillAI & modelsExplain, derive, and debug CSS math for measurement units, calc(), min(), max(), clamp(), custom properties, inheritance, em/rem scaling, percentages, viewport units, and box model formulas. Use when CSS dimensions compute unexpectedly, when mixing units, when building scalable spacing/type systems, or when reviewing box sizing and inherited values.
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Details
Instructions available. Your AI can read the instructions. Execution depends on the setup they require.
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What this skill tells your AI
The instructions your AI receives, as published by hashgraph-online/awesome-codex-plugins in plugins/LVTD-LLC/skills/skills/css-math-units/SKILL.md and read by Ahel’s review.
Use this skill to trace how CSS values become computed layout values. It is useful for unit conversion, inherited size multiplication, calc expressions, custom property math, and box model sizing.
Quick Start
- Read
guidelines.mdto select the smallest relevant file set. - Load
references/css-calculations/rules.mdfor implementation decisions. - Load
references/css-calculations/examples.mdwhen editing code. - Use
workflows/debug-css-calculation.mdfor multi-step derivation or debugging.
Contents
| Resource | Purpose |
|---|---|
guidelines.md | Routes tasks to the right reference files |
references/source-map.md | Book source and chapter/section traceability |
references/css-calculations/knowledge.md | Core concepts and terminology |
references/css-calculations/rules.md | Practical rules, guidelines, and exceptions |
references/css-calculations/examples.md | Bad/good examples and refactoring approach |
references/css-calculations/patterns.md | Reusable formula and implementation patterns |
references/css-calculations/checklist.md | Review checklist and red flags |
workflows/debug-css-calculation.md | Step-by-step workflow |
Source
Derived from Math for Web Design by Paul McFedries, Chapter 3: Math basics for CSS.
Citations are tracked in references/source-map.md.
Signals
- GitHub stars
- 1k
- Forks
- 316
- Last commit
- Oct 2026
Advanced
- Item type
- skill
- Key
css-math-units- Source
- github.com/hashgraph-online/awesome-codex-plugins
github.com/hashgraph-online/awesome-codex-plugins