Common Grid Mistakes
Even experienced developers make these mistakes. Learning to spot and fix them will save you hours of debugging.
Mistake #1: Forgetting display: grid
The most common mistake - forgetting to actually enable Grid!
❌ Wrong:
.container {
grid-template-columns: 1fr 1fr 1fr;
/* Missing display: grid! */
}✅ Correct:
.container {
display: grid;
grid-template-columns: 1fr 1fr 1fr;
}Mistake #2: Using Commas in grid-template-columns
Grid values are space-separated, NOT comma-separated!
❌ Wrong:
grid-template-columns: 1fr, 1fr, 1fr;✅ Correct:
grid-template-columns: 1fr 1fr 1fr;Mistake #3: Mixing Up grid-column and grid-template-columns
These are different properties with different purposes!
grid-template-columns- Defines columns on the containergrid-column- Places an item within the grid
/* Container */
.grid {
display: grid;
grid-template-columns: 1fr 1fr 1fr;
}
/* Item */
.item {
grid-column: span 2; /* Item spans 2 columns */
}Mistake #4: Percentages with Gap
Percentages don't account for gap space - use FR units instead!
❌ Wrong (columns overflow):
grid-template-columns: 33.33% 33.33% 33.33%;
gap: 20px; /* Gap breaks the layout! */✅ Correct:
grid-template-columns: 1fr 1fr 1fr;
gap: 20px; /* Gap is automatically accounted for */Mistake #5: Using Old Syntax
The old grid-gap property still works but use modern gap instead.
⚠️ Old (still works):
grid-gap: 20px;✅ Modern:
gap: 20px;Mistake #6: Not Planning for Mobile
Always test on mobile! Many columns don't work on small screens.
/* Desktop: 4 columns */
.grid {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 20px;
}
/* Mobile: 1 column */
@media (max-width: 768px) {
.grid {
grid-template-columns: 1fr;
}
}Mistake #7: Overthinking Alignment
Don't use Grid for centering a single item - Flexbox is simpler!
💡 Better with Flexbox:
.center {
display: flex;
align-items: center;
justify-content: center;
}Debugging Tips
- Use browser DevTools to visualize the grid (Firefox has excellent Grid tools)
- Add a border to items to see their actual size
- Check that
display: gridis actually applied - Verify no commas in column/row definitions
- Test on mobile early and often
✅ Pro Tip:
When something doesn't work, first check: Is display: grid set? Are there any commas?
These two issues cause 90% of Grid problems!