Open your website on a 27-inch 4K display. There is a reasonable chance the content is stranded in a thin column down the middle, the type looks tiny, and every photograph is soft.
Why it happens
Most sites are built with a maximum container width around 1200px and a fixed base font size. On a 1440px laptop that is correct. On a 3840px display it is a postage stamp.
Fixed type does not scale
A 16px base is right for a laptop and small on a large monitor viewed from further away. Fluid type using clamp() lets the scale grow smoothly with the viewport instead of stepping at arbitrary breakpoints.
Images give it away
Serving a 1200px-wide image into a container displayed at 1800px on a 2x display means the browser upscales it roughly three times. It looks soft, and everyone notices even if they cannot say why.
The fix
Add a breakpoint above 2560px that widens the container and raises the base font size. Serve srcset variants up to 2400px or beyond for anything full-bleed. Use SVG for logos and icons so they stay crisp at any density.
It is a small amount of work, and it is the difference between a site that was designed and a site that was merely built.
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