Why design mobile-first?
Because it forces you to focus on the essential content for the smallest screens, then progressively enhance for bigger viewports. This produces a UI that works on every size, instead of one that breaks on mobile.
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More FAQs in Making a React UI Responsive: Best Practices
Design mobile-first, use breakpoint prefixes (Tailwind) or media queries (CSS), test on real devices, use flexible layouts with flexbox and grid, use responsive images with srcset, ensure adequate touch targets, and plan mobile navigation in the layout.
Because browser resizing hides real responsive issues like touch target size, real viewport dimensions, and device-specific quirks. Test on actual phones and tablets or accurate emulators to catch what resizing misses.
At least 44x44 pixels, so they are easy to tap. Do not shrink buttons or links to sizes that are hard to touch, which is a common mobile UX mistake.
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