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Responsive design guides
Practical, copy-paste guides for fixing responsive problems on websites and mobile apps.
↔️How to fix horizontal scroll on mobile (CSS overflow guide)Your page wobbles sideways on phones? Find the exact element that overflows in 30 seconds and fix it with the right CSS — not just overflow-x: hidden.3 min read →📏Responsive breakpoints in 2026: which screen sizes to testThe CSS breakpoints that actually matter in 2026, the real device widths behind them, mobile-first media query templates, and how to choose breakpoints from your content instead of device names.3 min read →🔍The viewport meta tag: a complete guideWhat <meta name="viewport"> does, the one line every page needs, what viewport-fit=cover and interactive-widget do, and the settings you should never use.2 min read →📱Safe areas & the notch: stop content hiding on iPhone and AndroidHow to keep buttons and text out from under the notch, Dynamic Island, punch-hole camera and home indicator — with fixes for websites/PWAs, Flutter, React Native and native Android.2 min read →🖼️App Store & Google Play screenshot sizes (2026 cheat sheet)Every screenshot size and rule you need to publish on the App Store and Google Play: required iPhone and iPad sizes, Play's 2:1 rule, file formats, icons and feature graphics — plus a free checker.2 min read →💻How to test a website on mobile without a phoneSix free ways to see how your website looks and works on iPhone and Android from a desktop — online checkers, browser device modes, simulators and emulators — and what each one can't show you.2 min read →✅Google Mobile-Friendly Test is gone: what to use insteadGoogle retired the Mobile-Friendly Test and the Mobile Usability report in December 2023. Here's how to check a page is mobile-friendly now — and what Google actually looks at.2 min read →👆Tap target size: the 44px rule for mobile buttons and linksHow big buttons and links should be on mobile according to WCAG 2.2, Apple and Material Design — and CSS techniques to enlarge tap areas without changing your design.2 min read →