Claude Code
mobile
Responsive Layout Breaks Below 375px Screen Width
Your application's layout breaks on very small screens (below 375px width), even though it looks fine on standard mobile sizes. Elements overflow horizontally, text gets cut off, buttons become untappable, and the page requires horizontal scrolling to use.
This affects users with older or smaller phones (iPhone SE, Galaxy A series), users who have increased their system font size, and users viewing your app in split-screen mode on tablets. These are real users who are completely locked out of your app.
Claude Code typically generates responsive CSS targeting common breakpoints (768px, 640px) but doesn't account for screens smaller than 375px, where fixed pixel widths, min-width declarations, and padding cause layout overflow.
Error Messages You Might See
Horizontal scroll appears on mobile
Layout shifts when rotating device
Elements overflow viewport boundary
Touch targets too small (Lighthouse audit)
Common Causes
- min-width on containers — CSS rules like min-width: 375px or min-width: 320px prevent the layout from shrinking further
- Fixed pixel widths — Elements have width: 360px or similar fixed values that can't adapt to smaller screens
- Horizontal padding overflow — Container padding (e.g., px-8 / 32px on each side) consumes too much of the narrow viewport
- Flexbox not wrapping — Row layouts with flex-nowrap force elements side by side when they should stack
- Media queries start too high — The smallest breakpoint is 640px, with no styles for screens below that
How to Fix It
- Design mobile-first — Write base styles for the smallest screen, then add complexity with min-width media queries
- Replace fixed widths with percentages or max-width — Use width: 100% or max-width: 100% instead of pixel values
- Reduce padding on small screens — Use responsive padding like p-3 sm:p-6 to reduce spacing on narrow viewports
- Test at 320px width — Use Chrome DevTools responsive mode set to 320px to find overflow issues
- Add overflow-x: hidden cautiously — Only on the body element as a safety net, not as a fix for individual layout issues
- Use clamp() for font sizes — Replace fixed font sizes with clamp(14px, 4vw, 18px) for fluid typography
Real developers can help you.
Jared Hasson
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Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
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Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
Tejas Chokhawala
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Focused on performance, clean architecture and shipping fast.
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Full stack dev w/ 20+ years of experience
prajwalfullstack
Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
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Victor Denisov
Developer
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
What is the smallest screen width I should support?
Design for 320px as the minimum. This covers iPhone SE, older Android phones, and split-screen tablet usage. Test at 320px during development to catch overflow issues early.
How do I find what's causing horizontal scroll?
In Chrome DevTools, add a temporary style: * { outline: 1px solid red; } to see every element's boundaries. The element extending beyond the viewport edge is your culprit.