Cursor
mobile
CSS Grid Layout Breaking on Small Screens in Cursor App
Your Cursor-generated CSS Grid layout looks great on desktop but completely breaks on mobile screens. Grid items overflow horizontally, content gets cut off, columns become impossibly narrow, or the layout collapses into an unreadable single column with wrong proportions.
CSS Grid is powerful but requires careful handling of responsive behavior. Cursor often generates grid layouts optimized for the desktop view you described in your prompt, using fixed column counts or pixel-based track sizes that don't adapt to smaller viewports. The grid might use grid-template-columns: repeat(4, 1fr) which creates four equal columns even on a 320px screen.
The issue manifests as horizontal scrolling, overlapping text, images squeezed to unusable sizes, or grid items that stack but retain incorrect heights and spacing from the desktop layout.
Error Messages You Might See
Horizontal scroll on mobile
Grid items overflowing container
Content cut off on small screens
Layout shift when rotating device
Common Causes
- Fixed column count without responsive breakpoints — Using
repeat(4, 1fr)orrepeat(3, 250px)which forces the same number of columns on all screen sizes - No minmax() usage — Grid tracks use fixed sizes instead of
minmax(min, max)which would allow them to shrink and grow - Grid gap too large for mobile — A gap of 32px or 48px that's fine on desktop eats into content space on a 375px screen
- Fixed pixel widths on grid items — Grid children have hardcoded width values that exceed the grid track size on small screens
- Auto-fill vs auto-fit confusion — Cursor used
auto-fillwhenauto-fitwas needed, or vice versa, causing empty tracks or content not stretching - Missing overflow handling on grid items — Text or images inside grid items overflow their boundaries without wrapping or scaling
How to Fix It
- Use auto-fit with minmax() — Replace fixed column counts with
grid-template-columns: repeat(auto-fit, minmax(280px, 1fr))which automatically adjusts column count based on available space - Add responsive grid breakpoints — Use media queries to change the grid: 1 column on mobile (<768px), 2 on tablet, 3-4 on desktop
- Scale gap with viewport — Use
gap: clamp(1rem, 2vw, 2rem)or responsive gap values in media queries so spacing adapts to screen size - Set max-width: 100% on grid children — Prevent images, tables, and other content from overflowing grid cells with
max-width: 100%; overflow: hidden; - Test at key breakpoints — Check your grid at 320px (iPhone SE), 375px (iPhone), 768px (tablet), and 1024px+ (desktop) in DevTools
- Consider Flexbox for simple layouts — If your layout is a single row that wraps,
display: flex; flex-wrap: wrap;may be simpler and more robust than Grid
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Richard McSorley
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Get HelpFrequently Asked Questions
What is the difference between auto-fill and auto-fit?
auto-fill creates as many tracks as will fit, even if they're empty. auto-fit collapses empty tracks so remaining items stretch to fill the row. For most responsive layouts, auto-fit is what you want because it ensures items fill the available width.
Should I use CSS Grid or Flexbox for responsive layouts?
Use Grid for two-dimensional layouts (rows AND columns) like card grids, dashboards, and page layouts. Use Flexbox for one-dimensional layouts (a single row or column) like navigation bars, button groups, or card content. Many responsive designs use both together.