# UI Responsive Grids > Advanced CSS Grid and Flexbox techniques for layouts that adapt seamlessly to any device. Use when this capability is needed. - Skill: `tomevault-io/ui-responsive-grids` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/ui-responsive-grids` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/ui-responsive-grids/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Web & Frontend - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/ui-responsive-grids --- # Responsive Grids A layout should be fluid, not just "breakpoint-dependent." This skill explores the power of modern CSS for flexible design. ## CSS Grid - **Auto-Fill vs. Auto-Fit**: Create many-column layouts that adjust automatically without media queries. - **Fractional Units (fr)**: Flexible distribution of space. - **Grid Areas**: For semantic, easy-to-read layout structures. ## Flexbox - **Alignment**: Mastering `justify-content` and `align-items`. - **Flex-Grow/Shrink**: Controlling how items fill or squeeze into space. - **Gap**: Using the modern `gap` property instead of margin hacking. ## The "Modern" Breakpoint Instead of hardcoding device widths, use `minmax()` and `clamp()` to create truly fluid typography and layouts. `width: clamp(300px, 50%, 800px);` --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/jcorpac) — claim your Tome and manage your conversions.