Comet Border CSS Button

Free46 lines · no JS

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Theme

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

States

default

hover

focus-visible

active

not declared

disabled

not declared

.btn-comet-border {
  position: relative;
  z-index: 0;
  overflow: hidden;
  display: inline-block;
  padding: 13px 28px;
  border: none;
  border-radius: 12px;
  background: transparent;
  color: #e2e8f0;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.btn-comet-border::before {
  content: "";
  position: absolute;
  z-index: -2;
  left: -50%;
  top: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(from 0deg, transparent 0deg, transparent 260deg, #22d3ee 320deg, #a5f3fc 355deg, transparent 360deg);
  animation: btn-comet-border-spin 1.8s linear infinite;
}
.btn-comet-border::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 2px;
  border-radius: 10px;
  background: #0d0d11;
}
.btn-comet-border:hover::after {
  background: #14141d;
}
@keyframes btn-comet-border-spin {
  to {
    transform: rotate(360deg);
  }
}
.btn-comet-border:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

Self-contained · MIT · no build step.btn-comet-border

FuturisticRoundedBorder FXAnimated

Implementation notes

About the Comet Border CSS button

Comet Border uses technical geometry and motion for an engineered visual language. Its rounded corners balance product-friendly softness with a clear boundary. Motion comes from a 1.8s keyframe animation. The border fx, animated details are included in the copy-paste CSS.

Usage

<button class="btn-comet-border">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: Rounded
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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