Viewport Units

Viewport units are a set of relative CSS length units based on the size of the browser's visible area (the viewport). They offer a powerful way to create responsive designs that adapt fluidly to different screen sizes without relying solely on media queries.

There are four main viewport units:

• vw – 1% of the viewport width

• vh – 1% of the viewport height

• vmin – 1% of the smaller of the width or height

• vmax – 1% of the larger of the width or height

Example:

css

.hero {
  height: 100vh; /* Full screen height */
  width: 100vw;  /* Full screen width */
}

Use cases include:

• Creating full-screen sections or modals (100vh)

• Sizing text or elements relative to screen size

• Building layouts that scale naturally with the viewport

Viewport units shine in minimal, scalable design systems—perfect for mobile-first development and fluid interfaces.

They do have some quirks (e.g., on mobile browsers where toolbars affect height), so testing across devices is key. But when used wisely, they offer a flexible, clean alternative to fixed or percentage-based units.

What is Superflex.ai?

We’ve all seen great designs lose their edge during development. Superflex solves that by generating real, usable React components directly from your Figma files. It respects your design system, keeps your UI logic clean, and helps developers stay true to the original vision—without extra interpretation or cleanup.