Hairline CSS Button

Free42 lines · no JS

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Theme

A real <button> carrying .btn-hairline — the preview is the stylesheet, not a picture of it.

States

default

hover

focus-visible

active

disabled

not declared

.btn-hairline {
  position: relative;
  display: inline-block;
  padding: 10px 4px 12px;
  border: none;
  border-radius: 0;
  background: transparent;
  color: #d1d5db;
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.25s ease;
}
.btn-hairline::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 44%;
  height: 1px;
  background: #6b7280;
  transform: translateX(-50%);
  transition: width 0.3s ease, background 0.3s ease;
}
.btn-hairline:hover {
  color: #ffffff;
}
.btn-hairline:hover::after {
  width: 100%;
  background: #e5e7eb;
}
.btn-hairline:active {
  color: #d1d5db;
}
.btn-hairline:active::after {
  background: #9ca3af;
}
.btn-hairline:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

Self-contained · MIT · no build step.btn-hairline

MinimalSquareHover Reveal

Implementation notes

About the Hairline CSS button

Hairline uses restrained decoration that keeps the surrounding content in focus. Its square geometry creates a compact, precise control. The hover reveal details are included in the copy-paste CSS.

Usage

<button class="btn-hairline">Button</button>

Pair it with the CSS tab above — the class is self-contained.

Before shipping: keep the semantic button element, verify contrast on your actual background and add a visible:focus-visible state. If you retain motion, include a prefers-reduced-motion override.

Built with: HTML + plain CSS
Shape: Square
Exports: CSS, Tailwind, React
License: MIT · commercial use

Complete the look

Build the interface around this button

We matched its palette, surface, geometry and motion to a complete UI system — like composing an outfit, not browsing unrelated parts.

Style DNA · v1

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Pro preview

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