Breathing Line CSS Button

Free43 lines · no JS

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Theme

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

States

default

hover

focus-visible

active

not declared

disabled

not declared

.btn-breathing-line {
  position: relative;
  display: inline-block;
  padding: 12px 16px 16px;
  border: none;
  background: transparent;
  color: #a5f3fc;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.btn-breathing-line::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 50%;
  height: 3px;
  border-radius: 2px;
  background: #22d3ee;
  transform: translateX(-50%);
  animation: btn-breathing-line-pulse 2s ease-in-out infinite;
}
.btn-breathing-line:hover::after {
  animation-duration: 0.8s;
}
@keyframes btn-breathing-line-pulse {
  0%, 100% {
    width: 50%;
    opacity: 0.7;
    box-shadow: 0 0 6px rgba(34, 211, 238, 0.6);
  }
  50% {
    width: 100%;
    opacity: 1;
    box-shadow: 0 0 18px rgba(34, 211, 238, 0.9);
  }
}
.btn-breathing-line:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

Self-contained · MIT · no build step.btn-breathing-line

Neon & GlowSquareAnimatedBorder FX

Implementation notes

About the Breathing Line CSS button

Breathing Line uses luminous contrast designed for dark and futuristic interfaces. Its square geometry creates a compact, precise control. Motion comes from a 2s keyframe animation. The animated, border fx details are included in the copy-paste CSS.

Usage

<button class="btn-breathing-line">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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