CSS Grid vs Flexbox: When to Use Which

CSS Layout Systems: Grid vs Flexbox

Modern CSS provides two powerful layout systems: CSS Grid and Flexbox. Understanding when to use each is crucial for creating efficient, maintainable layouts.

Flexbox: One-Dimensional Layouts

Flexbox is designed for one-dimensional layouts - either rows or columns.

When to Use Flexbox

• Navigation bars
• Card layouts
• Form controls
• Content that flows in one direction
• Aligning items within a container

Flexbox Example

.container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.item {
  flex: 1;
}

CSS Grid: Two-Dimensional Layouts

CSS Grid excels at two-dimensional layouts, controlling both rows and columns simultaneously.

When to Use CSS Grid

• Page layouts
• Complex grid systems
• Dashboard layouts
• Magazine-style layouts
• Content that needs precise positioning

CSS Grid Example

.container {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  grid-template-rows: auto 1fr auto;
  gap: 1rem;
}

.header {
  grid-column: 1 / -1;
}

.sidebar {
  grid-row: 2;
}

.main {
  grid-row: 2;
  grid-column: 2;
}

Combining Grid and Flexbox

These systems work great together. Use Grid for the overall page layout, and Flexbox for component-level layouts.

Hybrid Approach

/* Grid for page layout */
.page {
  display: grid;
  grid-template-columns: 250px 1fr;
  grid-template-rows: auto 1fr auto;
}

/* Flexbox for navigation */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Flexbox for cards */
.card {
  display: flex;
  flex-direction: column;
}

Browser Support

Both Grid and Flexbox have excellent browser support:

• Flexbox: IE 11+ (with prefixes), all modern browsers
• CSS Grid: IE 11+ (limited), Edge 16+, all modern browsers

Performance Considerations

Both systems are performant, but consider:

• Grid is better for complex 2D layouts
• Flexbox is lighter for simple 1D layouts
• Grid can handle overlapping content more easily
• Flexbox is better for dynamic content

Learning Resources

CSS Grid

• CSS Grid Garden (interactive game)
• Grid by Example
• MDN CSS Grid Guide

Flexbox

• Flexbox Froggy (interactive game)
• CSS-Tricks Flexbox Guide
• MDN Flexbox Guide

Conclusion

Choose based on your layout needs:

• Use Flexbox for one-dimensional layouts
• Use CSS Grid for two-dimensional layouts
• Combine both for complex applications

Practice with both systems to understand their strengths and when to apply each approach.