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楊東霖
楊東霖

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CSS Flexbox vs Grid: Complete Guide 2026 — When to Use Which

#css #webdev #frontend #design

CSS Flexbox and Grid are the two most powerful layout systems in modern CSS. But most developers don't fully understand when to use which — and end up overusing Grid for everything or using Flexbox for two-dimensional layouts.

This guide gives you the decision framework you need.

The Core Difference

Flexbox Grid
**Dimension** 1D (row OR column) 2D (rows AND columns)
**Control** Content-driven Layout-driven
**Best for** Components, navigation Page layouts, dashboards
**Browser Support** 98%+ 98%+

When to Use Flexbox

1. Navigation Bars 

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
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2. Card Components 

.card-container {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
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3. Centering Content 

.center-me {
  display: flex;
  justify-content: center;
  align-items: center;
}
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When to Use CSS Grid

1. Page Layouts 

.page-layout {
  display: grid;
  grid-template-columns: 250px 1fr 200px;
  grid-template-rows: auto 1fr auto;
  grid-template-areas: "header header header" "sidebar main aside" "footer footer footer";
  min-height: 100vh;
}
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2. Dashboard Cards 

.dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
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3. Image Galleries 

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
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The Decision Framework

  • Are you laying out in ONE direction? → Flexbox
  • Are you laying out in BOTH directions? → Grid
  • Do items wrap and size based on content? → Flexbox
  • Do you want items to follow a strict grid? → Grid

The Modern Mix: Grid + Flexbox 

.page {
  display: grid;           /* Page layout: 2D */
  grid-template: auto 1fr auto / 1fr;
}

.header {
  display: flex;           /* Header items: 1D */
  justify-content: space-between;
}

.card-grid {
  display: grid;          /* Card grid: 2D */
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  display: flex;           /* Card content: 1D */
  flex-direction: column;
}
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Common Mistakes

  • Using Grid for navbar — Flexbox is simpler and more appropriate for 1D layouts
  • Using Flexbox for page layout — Grid gives you more control over 2D layouts
  • Forgetting flex-wrap — Items won't wrap without flex-wrap: wrap
  • Using Grid for centering — Flexbox justify-content: center is simpler

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