Animated border beam effect for React. A lightweight component that adds a traveling or breathing glow animation around any element — cards, buttons, inputs, or search bars.

npm install border-beam

import { BorderBeam } from 'border-beam';

function App() {
  return (
    <BorderBeam>
      <div style={{ padding: 32, borderRadius: 16, background: '#1d1d1d' }}>
        Your content here
      </div>
    </BorderBeam>
  );
}

The component wraps your content and overlays the animated beam effect. It auto-detects the border-radius of the first child element.

Built-in presets control the glow style and motion. They fall into two families:

<BorderBeam size="md">  {/* Full border glow (default) */}
  <Card />
</BorderBeam>

<BorderBeam size="sm">  {/* Compact glow for small elements */}
  <IconButton />
</BorderBeam>

<BorderBeam size="line">  {/* Bottom-only traveling glow */}
  <SearchBar />
</BorderBeam>

<BorderBeam size="pulse-inner">    {/* Contained breathing border glow */}
  <Card />
</BorderBeam>

<BorderBeam size="pulse-outside">  {/* Outward-blooming halo around the element */}
  <Card />
</BorderBeam>

Both pulse types support all color variants, strength, theme, and the breathe speed via duration (defaults to 2.3).

pulse-outside requires an opaque wrapped child. The colorful core and halo render behind your content (z-index: -1) and bloom outward, so only the part that spills beyond the element shows. If your child is transparent, the inner glow will show through. The wrapper uses overflow: visible, so make sure the surrounding layout has room (or overflow: visible) for the halo to spill.

pulse-outside relies on the wrapped element's own 1px border as the idle hairline. It does not paint its own hairline by default, so the colored stroke rides directly on top of your element's existing edge instead of doubling it. If your child has no border, add a subtle 1px border (or box-shadow: inset 0 0 0 1px) so the edge stays defined while the beam is faded out.

Four color palettes are available:

<BorderBeam colorVariant="colorful" />  {/* Rainbow spectrum (default) */}
<BorderBeam colorVariant="mono" />      {/* Grayscale */}
<BorderBeam colorVariant="ocean" />     {/* Blue-purple tones */}
<BorderBeam colorVariant="sunset" />    {/* Orange-yellow-red tones */}

All variants except mono animate through a hue-shift cycle.

Adapts beam colors for dark or light backgrounds:

<BorderBeam theme="dark" />   {/* Dark background (default) */}
<BorderBeam theme="light" />  {/* Light background */}
<BorderBeam theme="auto" />   {/* Detects system preference */}

Control the overall intensity of the effect without affecting the wrapped content:

<BorderBeam strength={0.7}>  {/* 70% intensity */}
  <Card />
</BorderBeam>

strength accepts a value from 0 (invisible) to 1 (full intensity, default).

Toggle the animation on and off with smooth fade transitions:

const [active, setActive] = useState(true);

<BorderBeam active={active} onDeactivate={() => console.log('faded out')}>
  <Card />
</BorderBeam>

All standard HTMLDivElement attributes are also forwarded to the wrapper.

BorderBeam renders a wrapper <div> with:

• ::after — the beam stroke (rotate: conic gradient masked to the border; pulse: the colored perimeter ring / hairline)
• ::before — inner glow layer (pulse-outside pushes this outward behind the content)
• [data-beam-bloom] — outer bloom/glow child div

All effect layers are absolutely positioned and use pointer-events: none, so they never interfere with your content. The rotate and line types animate via CSS @property keyframes for smooth GPU-accelerated transitions; because the keyframes also declare explicit 0% / 50% / 100% stops, browsers without @property support degrade gracefully (stepped instead of interpolated motion) rather than breaking. The pulse types drive their slow breathing from a single shared, frame-rate-capped (~30fps) requestAnimationFrame loop that writes plain CSS custom properties — so the breathing works even without @property support, repaints less often, and automatically pauses when the instance is inactive, offscreen, or the user prefers reduced motion. The pulse types also isolate their stacking context, cap blur radii, and hint will-change on the animated layers for performance.

border-beam/
├── src/
│   ├── index.ts          # Public exports
│   ├── BorderBeam.tsx     # React component
│   ├── types.ts           # TypeScript type definitions
│   ├── styles.ts          # CSS generation engine
│   └── pulseDriver.ts     # Shared rAF loop driving the pulse breathing
├── demo/                  # Vite + React demo site
├── dist/                  # Built output (ESM + CJS + types)
├── package.json
├── LICENSE
└── README.md

• React 18+
• Modern browser with CSS @property support (Chrome 85+, Safari 15.4+, Firefox 128+)

The effect layers are purely decorative and use pointer-events: none. They do not affect keyboard navigation or screen readers. The pulse types ship a built-in prefers-reduced-motion: reduce block that disables their animations; the rotate types respect prefers-reduced-motion when implemented by the consumer.

MIT