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css-grid-math

Design
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Derive and debug CSS Grid layout math for grid coordinates, line placement, spans, negative indexes, fr units, minmax(), fit-content(), repeat(), auto-fill, and auto-fit. Use when building grid systems, explaining track sizing, troubleshooting fr distribution, placing items by line numbers, or converting a layout sketch into CSS Grid formulas.

QUICK START

How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
Prompt to paste
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Source SKILL.md: https://github.com/hashgraph-online/awesome-codex-plugins/blob/HEAD/plugins/LVTD-LLC/skills/skills/css-grid-math/SKILL.md

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CSS Grid Math

Use this skill when a grid needs to be reasoned about as a coordinate and sizing system. It helps calculate where items land, how tracks divide space, and why flexible tracks do not always produce expected widths.

Quick Start

  1. Read guidelines.md to select the smallest relevant file set.
  2. Load references/grid-layout/rules.md for implementation decisions.
  3. Load references/grid-layout/examples.md when editing code.
  4. Use workflows/debug-grid-layout.md for multi-step derivation or debugging.

Contents

ResourcePurpose
guidelines.mdRoutes tasks to the right reference files
references/source-map.mdBook source and chapter/section traceability
references/grid-layout/knowledge.mdCore concepts and terminology
references/grid-layout/rules.mdPractical rules, guidelines, and exceptions
references/grid-layout/examples.mdBad/good examples and refactoring approach
references/grid-layout/patterns.mdReusable formula and implementation patterns
references/grid-layout/checklist.mdReview checklist and red flags
workflows/debug-grid-layout.mdStep-by-step workflow

Source

Derived from Math for Web Design by Paul McFedries, Chapter 4: CSS Grid math. Citations are tracked in references/source-map.md.