Responsive Design

Responsive design isn’t some fancy bonus feature anymore—it’s the default expectation. If your site looks broken on mobile in 2025, you’re not just behind, you’re actively losing business. More than half of web traffic is mobile now, and that number’s still climbing.

The thing is, responsive design isn’t just about shrinking everything down. It’s about rethinking the entire experience for different contexts. Someone on their phone is probably doing something different than someone on a 27-inch monitor. They might be looking up your hours while standing outside your store, or trying to find a phone number, or doing a quick price check. Your mobile layout should prioritize those use cases.

Mobile-first design makes more sense than desktop-first at this point. Start with the constraints of a small screen, figure out what absolutely needs to be there, then expand for larger screens. Going the other way usually means you end up cramming too much onto mobile and the experience suffers.

Breakpoints matter, but you can’t just design for iPhone and call it done. Tablets exist in this weird middle ground. Foldable phones are a thing now. Giant monitors, laptop screens, everything in between. Your design needs to flex gracefully across that whole spectrum, not just hit three predetermined widths.

Images are usually the performance killer on mobile. Serving desktop-sized images to phones destroys load times and burns through data plans. Responsive images with proper srcset attributes, lazy loading, modern formats like WebP—this stuff actually matters for user experience, not just theoretical performance scores.

Touch targets need to be bigger than you think. What works with a mouse cursor doesn't work with a thumb. Buttons that are too small or too close together are infuriating on mobile. Apple recommends 44x44 pixels minimum. If your nav menu requires precision tapping, you've failed.

Forms on mobile are often nightmares. Multi-column layouts that work on desktop become scroll-hell on phones. Input fields that don’t trigger the right keyboard (like getting the full keyboard when entering a phone number instead of the numeric keypad) are amateur moves. Autofill should work. Every extra field you require is another reason someone might abandon the form.

Performance on mobile networks is different than on broadband. Your site might load fine on your office wifi, but on spotty 4G or throttled 5G it could be a disaster. Testing on actual mobile networks, not just DevTools throttling, reveals problems you wouldn’t otherwise catch.

The hamburger menu debate continues. Some designers hate them, claiming they hide navigation. But on mobile, you don’t have infinite horizontal space. Sometimes a clean hamburger menu is better than a cramped, awkward navigation that doesn’t quite fit. Context matters more than dogma.

CSS frameworks make responsive design easier, but they can also make your site look generic. Bootstrap sites are recognizable. Tailwind’s better but still has a certain sameness. Custom responsive design takes more work but can actually reflect your brand instead of looking like everyone else’s solution.