What breakpoints should I use?

Common ones: 640px (sm), 768px (md), 1024px (lg), 1280px (xl). It’s important to design for content, not just devices – choose points where the layout really needs to change.

What is mobile first?

You write styles first for small screens, then add styles for larger ones with min-width media queries. That way small devices don’t load extra CSS and the design is oriented to mobile traffic.

Responsive Design – Best Practices for Mobile and Desktop

Q: How do I make images responsive?

Use max-width: 100% and height: auto so they don’t overflow. For performance use srcset and sizes or a component like next/image for automatic sizes and formats.

Responsive Design – Best Practices

Responsive design makes sure the site looks and works well on phones, tablets, and desktops. The foundation is a fluid grid (Grid/Flexbox), typography in relative units, and images that scale.

Breakpoints and Mobile First

Breakpoints are the widths where you change the layout (e.g. one column → two → three). Common values: 640px, 768px, 1024px, 1280px. It’s more important to think about content – where the page logic requires a change – than specific device models.

Mobile first means writing CSS for small screens first and adding styles for larger with min-width media queries. That way mobile users get less redundant code and the design is aligned with dominant mobile traffic.

Fluid Grid and Typography

Use CSS Grid or Flexbox for layout. Set widths in percentages, fr, or max-width instead of fixed pixels. For text use relative units (rem, em) and adjust font-size for larger screens with media queries if needed. Minimum size for body text: 16px equivalent for readability on mobile.

Images and Media

For images: max-width: 100%; height: auto; prevents overflow. For performance use srcset and sizes or a component like Next.js Image so the browser picks the right size and format (e.g. WebP). Avoid huge fixed dimensions on mobile.

Testing

Test on real devices or with DevTools responsive mode. Check touch targets (min 44x44px), text readability, and navigation without hover. Google uses mobile-first indexing – the mobile version is critical for SEO.

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