# Comet loader

> A bright point of light racing around a circle, trailing a tail that fades into the dark.

- Category: [Loaders](https://library.aimran.es/components/loaders)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/css-comet
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

A comet circling in the dark has a sense of speed and distance, which makes it a nice match for a flight search on a travel site, a GPS app locating your position or the landing page of a space startup. The ring is thin and elegant, and the tail fades gradually from the second color into nothing.

It looks best on dark backgrounds, where the head really glows. On light pages, pick a strong main color so the head doesn’t wash out. Faster speeds suit the travel theme; slower ones feel more like a quiet night sky.

## Code

### HTML

```html
<div class="ul-cm"></div>
```

### CSS

```css
.ul-cm {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 72px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --bg: #f5f5f7;
}

.ul-cm {
  position: relative;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  background: conic-gradient(from 90deg,transparent 0 45%,color-mix(in srgb,var(--c2) 40%,transparent) 75%,var(--c1));
  -webkit-mask: radial-gradient(farthest-side,transparent calc(100% - var(--s) / 14),#000 calc(100% - var(--s) / 14 + 1px));
  mask: radial-gradient(farthest-side,transparent calc(100% - var(--s) / 14),#000 calc(100% - var(--s) / 14 + 1px));
  animation: ul-spin calc(1.1s / var(--k)) linear infinite;
}

@keyframes ul-spin {
  to {
    transform: rotate(360deg);
  }
}
```

### React

```tsx
import type { CSSProperties } from "react";

const css = `
.ul-cm {
  position: relative;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  background: conic-gradient(from 90deg,transparent 0 45%,color-mix(in srgb,var(--c2) 40%,transparent) 75%,var(--c1));
  -webkit-mask: radial-gradient(farthest-side,transparent calc(100% - var(--s) / 14),#000 calc(100% - var(--s) / 14 + 1px));
  mask: radial-gradient(farthest-side,transparent calc(100% - var(--s) / 14),#000 calc(100% - var(--s) / 14 + 1px));
  animation: ul-spin calc(1.1s / var(--k)) linear infinite;
}

@keyframes ul-spin {
  to {
    transform: rotate(360deg);
  }
}
`;

export default function LoaderComet() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "72px",
          "--k": "1",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="ul-cm"></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 “Comet loader” block (Loaders) from AIMRAN Library to my project.

## What it is
A bright point of light racing around a circle, trailing a tail that fades into the dark.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 72px (from 24 to 120px)
- Speed: 1x (from 0.5 to 2x)

## 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
import type { CSSProperties } from "react";

const css = `
.ul-cm {
  position: relative;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  background: conic-gradient(from 90deg,transparent 0 45%,color-mix(in srgb,var(--c2) 40%,transparent) 75%,var(--c1));
  -webkit-mask: radial-gradient(farthest-side,transparent calc(100% - var(--s) / 14),#000 calc(100% - var(--s) / 14 + 1px));
  mask: radial-gradient(farthest-side,transparent calc(100% - var(--s) / 14),#000 calc(100% - var(--s) / 14 + 1px));
  animation: ul-spin calc(1.1s / var(--k)) linear infinite;
}

@keyframes ul-spin {
  to {
    transform: rotate(360deg);
  }
}
`;

export default function LoaderComet() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "72px",
          "--k": "1",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="ul-cm"></div>
      </div>
    </>
  );
}
```

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