# Spotlight border card

> A card whose thin border lights up exactly where the cursor is, with a faint glow spilling inside.

- Category: [Cards](https://library.aimran.es/components/cards)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-card-spot
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

The spotlight card effect is a favorite on developer tool and SaaS landing pages: a grid of feature cards like “Performance”, “Security” and “Integrations”, or the three tiers of a pricing section. As the mouse moves, a patch of light follows it along the border and warms the inside of the card. A few lines of JavaScript track the pointer.

It shines on dark pages with several cards side by side, each one catching the light as the cursor passes. On phones there's no cursor, so the light simply rests at the top center, which still looks tidy.

## Code

### HTML

```html
<div class="uv-ks"><div><h3>Performance</h3><p>Hover along the edge and watch the light follow you.</p></div></div>
```

### CSS

```css
.uv-ks {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 16px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --fg: #1d1d1f;
  /* texto */
  --bg: #f5f5f7;
  /* fondo */
}

.uv-ks {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  position: relative;
  width: 16em;
  padding: 1px;
  border-radius: 1.4em;
  font-size: var(--s);
  background: radial-gradient(12em circle at var(--x,50%) var(--y,0%),var(--c1),color-mix(in srgb,var(--fg) 12%,transparent) 60%);
}

.uv-ks>div {
  padding: 1.6em;
  border-radius: calc(1.4em - 1px);
  background: radial-gradient(14em circle at var(--x,50%) var(--y,0%),color-mix(in srgb,var(--c1) 10%,var(--bg)),var(--bg) 70%);
}

.uv-ks h3 {
  margin: 0 0 .4em;
  font-size: 1.2em;
  color: var(--fg);
}

.uv-ks p {
  margin: 0;
  font-size: .85em;
  line-height: 1.5;
  color: color-mix(in srgb,var(--fg) 60%,transparent);
}
```

### JavaScript

```js
document.querySelectorAll(".uv-ks").forEach(el => {
  el.addEventListener("pointermove",e=>{const r=el.getBoundingClientRect();el.style.setProperty("--x",e.clientX-r.left+"px");el.style.setProperty("--y",e.clientY-r.top+"px")})
});
```

### React

```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-ks {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  position: relative;
  width: 16em;
  padding: 1px;
  border-radius: 1.4em;
  font-size: var(--s);
  background: radial-gradient(12em circle at var(--x,50%) var(--y,0%),var(--c1),color-mix(in srgb,var(--fg) 12%,transparent) 60%);
}

.uv-ks>div {
  padding: 1.6em;
  border-radius: calc(1.4em - 1px);
  background: radial-gradient(14em circle at var(--x,50%) var(--y,0%),color-mix(in srgb,var(--c1) 10%,var(--bg)),var(--bg) 70%);
}

.uv-ks h3 {
  margin: 0 0 .4em;
  font-size: 1.2em;
  color: var(--fg);
}

.uv-ks p {
  margin: 0;
  font-size: .85em;
  line-height: 1.5;
  color: color-mix(in srgb,var(--fg) 60%,transparent);
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  el.addEventListener("pointermove",e=>{const r=el.getBoundingClientRect();el.style.setProperty("--x",e.clientX-r.left+"px");el.style.setProperty("--y",e.clientY-r.top+"px")})
}

export default function CardSpot() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-ks"><div><h3>Performance</h3><p>Hover along the edge and watch the light follow you.</p></div></div>
      </div>
    </>
  );
}
```

## Prompt for AI assistants

Paste this into ChatGPT, Claude, Cursor, v0 or Lovable to adapt the block to your stack (Tailwind, Vue, Svelte…):

````text
I want to add the “Spotlight border card” block (Cards) from AIMRAN Library to my project.

## What it is
A card whose thin border lights up exactly where the cursor is, with a faint glow spilling inside.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- Speed: 1x (from 0.5 to 2x)
- Text: "Performance"

## What I need
1. Add it to my project with the same look and animation as the reference code: same sizes, colours, radii, shadows, timings and easing.
2. It is built with plain HTML and CSS (the reference wraps it in a React component with its CSS). If my project uses something else (Vue, Svelte, Astro, plain HTML…), translate it without losing any behaviour. If I use Tailwind, turn the styles into classes; if not, keep the CSS in its own file.
3. Expose the settings above as props (or CSS variables) with those values as defaults.
4. Make it work well on phones: nothing that depends only on hover, touch targets of at least 44 px and no overflow on 320 px screens.
5. Make it look right in light and dark mode.
6. Keep it accessible: semantic HTML, roles and aria-* where needed, visible focus and keyboard support.
7. Respect prefers-reduced-motion: with reduced motion, no big animations but the same end result.

## Reference code
```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-ks {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  position: relative;
  width: 16em;
  padding: 1px;
  border-radius: 1.4em;
  font-size: var(--s);
  background: radial-gradient(12em circle at var(--x,50%) var(--y,0%),var(--c1),color-mix(in srgb,var(--fg) 12%,transparent) 60%);
}

.uv-ks>div {
  padding: 1.6em;
  border-radius: calc(1.4em - 1px);
  background: radial-gradient(14em circle at var(--x,50%) var(--y,0%),color-mix(in srgb,var(--c1) 10%,var(--bg)),var(--bg) 70%);
}

.uv-ks h3 {
  margin: 0 0 .4em;
  font-size: 1.2em;
  color: var(--fg);
}

.uv-ks p {
  margin: 0;
  font-size: .85em;
  line-height: 1.5;
  color: color-mix(in srgb,var(--fg) 60%,transparent);
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  el.addEventListener("pointermove",e=>{const r=el.getBoundingClientRect();el.style.setProperty("--x",e.clientX-r.left+"px");el.style.setProperty("--y",e.clientY-r.top+"px")})
}

export default function CardSpot() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-ks"><div><h3>Performance</h3><p>Hover along the edge and watch the light follow you.</p></div></div>
      </div>
    </>
  );
}
```

Give me the complete final code, ready to paste, and tell me in one line where to put it in my project.
````