gabrielmoreira shadcn/Tailwind Layouts
Help generate shadcn/Tailwind components that render correctly the first time. Most agent-generated UI fails due to missing mental models about how CSS layout works—not syntax errors, but assumption gaps.
When to Use This Skill
Use this skill when:
- Creating shadcn/Tailwind layouts
- Debugging height/scroll issues
- Fixing flex/grid problems
- Setting up full-page app shells
Do NOT use this skill when:
- Writing backend code
- Working on non-Tailwind CSS projects
- Designing (use frontend-design first)
Core Principle
CSS layout flows from constraints. Height flows down from explicit ancestors. Width flows up from content. Agents fail because they apply classes without understanding the constraint chain.
Critical Mental Models
Model 1: Height Inheritance Chain
h-full means height: 100%. 100% of what? 100% of the parent's computed height.
BROKEN (chain incomplete):
<html> <!-- no height -->
<body> <!-- no height -->
<div class="h-full"> <!-- 100% of nothing = 0 -->
WORKING (chain complete):
<html class="h-full"> <!-- 100% of viewport -->
<body class="h-full"> <!-- 100% of html -->
<div class="h-full"> <!-- 100% of body = works -->
Rule: Trace from element up to <html>. Every ancestor needs explicit height, OR use viewport units (h-screen) to break the chain.
Model 2: Flex Overflow Gotcha
Flex children have implicit min-height: auto, preventing shrinking below content size.
// BROKEN (won't scroll)
<div className="flex flex-col h-screen">
<main className="flex-1 overflow-y-auto"> {/* Can't shrink! */}
// WORKING (scrolls correctly)
<div className="flex flex-col h-screen">
<main className="flex-1 overflow-y-auto min-h-0"> {/* Can shrink */}
Rule: Flex children that scroll need min-h-0. Children that shouldn't shrink need shrink-0.
Model 3: Grid Parent/Child Separation
Grid is defined on the parent. Children just occupy cells.
// BROKEN
<div className="grid-cols-3"> {/* Missing 'grid'! */}
// WORKING
<div className="grid grid-cols-3"> {/* 'grid' enables grid-cols-* */}
Rule: flex or grid must be declared on parent before direction/template classes work.
Model 4: Scroll Container Dimensions
Scroll containers need explicit dimensions to know when to scroll.
// BROKEN (never scrolls)
<ScrollArea> {/* No height constraint */}
// WORKING (flex-constrained)
<div className="flex flex-col h-screen">
<ScrollArea className="flex-1 min-h-0">
Diagnostic States
SL1: Height Chain Broken
Symptoms: Elements collapse, h-full not working
Fix: Trace to html, add heights or use h-screen
SL2: Flex Overflow Blocked
Symptoms: Scroll doesn't work, content overflows
Fix: Add min-h-0 to flex children that scroll
SL3: Grid Structure Wrong
Symptoms: Items stack vertically instead of columns
Fix: Ensure grid grid-cols-* on parent
SL4: Styles Not Applying
Symptoms: Unstyled components, colors wrong Fix: Check Tailwind content paths, CSS variables in globals.css
SL5: Component Dependencies Missing
Symptoms: "Module not found", functionality broken
Fix: npx shadcn add [component], install peer deps
Common Layout Patterns
Full-Page App Shell
// layout.tsx
<html lang="en" className="h-full">
<body className="h-full">{children}</body>
</html>
// page.tsx
<div className="flex h-full">
<aside className="w-64 shrink-0 border-r overflow-y-auto">
<nav>...</nav>
</aside>
<main className="flex-1 min-w-0 overflow-y-auto">
{children}
</main>
</div>
Dashboard with Header
<div className="flex flex-col h-screen">
<header className="h-16 shrink-0 border-b">...</header>
<div className="flex flex-1 min-h-0">
<aside className="w-64 shrink-0 border-r overflow-y-auto">...</aside>
<main className="flex-1 min-w-0 overflow-y-auto p-6">
{children}
</main>
</div>
</div>
Card Grid
<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
{items.map(item => (
<Card key={item.id}>
<CardHeader><CardTitle>{item.title}</CardTitle></CardHeader>
<CardContent>{item.content}</CardContent>
</Card>
))}
</div>
Anti-Patterns
The Height Assumption
Using h-full without verifying ancestor chain.
Fix: Trace to html. Use h-screen to break chain.
The Overflow Ignorance
Adding overflow-y-auto without min-h-0 on flex children.
Fix: Flex children need min-h-0 to shrink.
The Import Guess
Guessing import paths like shadcn/ui.
Fix: Check components.json for alias. Usually @/components/ui/*.
The Flat Compound
Flattening compound components (Dialog without DialogTrigger/DialogContent). Fix: Maintain required nesting structure.
Pre-Generation Checklist
- Import alias known (
@/components/ui/*) - html has
h-full - body has
h-fullormin-h-full - Scroll containers have explicit height
- Flex scroll children have
min-h-0 - Fixed elements have
shrink-0
Related Skills
- frontend-design - Design decisions before implementation
- react-pwa - PWA features for React apps