CSS Overflow Issues in Vibecoded Apps

Overflow bugs manifest as content spilling outside its container, unwanted horizontal scrollbars on the page, or text being cut off without ellipsis or scroll affordance. Resize your browser window to different widths and watch for layout breaks. Long unbroken strings like URLs or email addresses are common triggers.

Check for content hidden behind other elements. AI-generated CSS often uses fixed heights or absolute positioning that works for short content but breaks when real-world data is longer than expected. Inspect elements with DevTools and look for content that extends beyond its parent boundaries.

Enter long text without spaces into input fields, names, and descriptions. Paste URLs, long email addresses, or strings of repeated characters. These trigger overflow where the AI assumed content would be short and well-formatted.

Test at every common breakpoint: 320px, 375px, 768px, 1024px, 1440px, and ultra-wide screens. Zoom the browser to 150% and 200%. Overflow issues that are invisible at standard zoom often appear when the viewport effectively shrinks through zooming.

Apply overflow-wrap: break-word or word-break: break-word to text containers that might hold long unbroken strings. Use overflow: hidden with text-overflow: ellipsis for single-line truncation, or overflow: auto for scrollable areas.

Replace fixed widths and heights with min/max constraints. Use CSS Grid or Flexbox with proper min-width: 0 on flex children to prevent them from overflowing their parent. Audit all containers with DevTools and ensure no element has a fixed size that cannot accommodate variable content lengths.