CSS Grid Items Overlapping Fix

In this tutorial, you'll learn about CSS Grid Items Overlapping Fix. We cover key concepts, practical examples, and best practices.

The Problem

Grid items overlap each other or sit on top of one another instead of occupying distinct cells. This happens when explicit grid placements conflict, grid areas overlap, or negative gaps are used incorrectly.

Quick Fix

Step 1: Check grid-template-areas for duplicates

Each area name must appear exactly once in the grid template:

/* Wrong — duplicate "sidebar" area */
.grid {
    display: grid;
    grid-template-areas:
        "sidebar sidebar"
        "main main";
}

/* Right — unique area names */
.grid {
    display: grid;
    grid-template-areas:
        "sidebar main"
        "footer footer";
}

Expected output: Items occupy distinct named cells without overlap.

Step 2: Verify grid-column and grid-row values

Explicit placement that extends beyond the defined grid causes overlap:

.item {
    /* Wrong — extends beyond available columns */
    grid-column: 1 / 5;
    /* Right — stays within grid bounds */
    grid-column: 1 / 3;
}

Expected output: Items fit within the defined grid columns.

Step 3: Check for overlapping placement declarations

Two items targeting the same area will overlap:

.item1 {
    grid-area: 1 / 1 / 2 / 3;
}
.item2 {
    /* Wrong — same area as item1 */
    grid-area: 1 / 1 / 2 / 3;
    /* Right — different area */
    grid-area: 2 / 1 / 3 / 3;
}

Expected output: Each item occupies a unique grid cell or track.

Step 4: Avoid negative gaps

CSS Grid does not support negative gap values:

/* Wrong — negative gap */
.grid {
    display: grid;
    gap: -10px;
}

/* Right — use positive gap or margin adjustments */
.grid {
    display: grid;
    gap: 10px;
}

Expected output: Positive gap creates space between items without overlap.

Step 5: Use z-index for intentional overlap

If overlap is intentional, control stacking order:

.item-overlay {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
    z-index: 2;
}
.item-background {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
    z-index: 1;
}

Expected output: The item with higher z-index renders on top.

Prevention

• Use grid-template-areas for a visual map of your layout
• Avoid mixing implicit and explicit placement on the same axis
• Check that grid-column and grid-row values do not overlap with sibling items
• Use DevTools Grid overlay to visualize cell boundaries

Common Mistakes with grid overlap

1. Mixing let bindings with <- bindings in do notation, producing type errors
2. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors
3. Non-exhaustive pattern matches that compile with warnings then crash at runtime

These mistakes appear frequently in real-world CSS code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ