# Spiral to center loader

> Dots that swirl inward in a tightening spiral, shrinking and fading as they reach the middle.

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

## Where to use it

Everything in this loader flows toward the center, which gives it a converging, “putting it together” feel. That fits an AI image generator building a picture, a photo editor applying a filter or a tool compressing files into a zip. The alternating colors add depth to the spiral without any JavaScript, just HTML and CSS.

It is quite hypnotic, which is lovely for a few seconds and a bit much for a whole minute. For long jobs, pair it with a line of text that says what is happening. Two contrasting colors make the swirl easier to follow.

## Code

### HTML

```html
<div class="ul-sp"><i style="--i:0"></i><i style="--i:1"></i><i style="--i:2"></i><i style="--i:3"></i><i style="--i:4"></i><i style="--i:5"></i><i style="--i:6"></i><i style="--i:7"></i><i style="--i:8"></i><i style="--i:9"></i></div>
```

### CSS

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

.ul-sp {
  position: relative;
  width: calc(var(--s) * 1.3);
  height: calc(var(--s) * 1.3);
}

.ul-sp i {
  position: absolute;
  left: 50%;
  top: 50%;
  width: calc(var(--s) / 8);
  height: calc(var(--s) / 8);
  margin: calc(var(--s) / -16);
  border-radius: 50%;
  background: var(--c1);
  opacity: 0;
  animation: ul-sp calc(2.5s / var(--k)) cubic-bezier(.4,0,.6,1) infinite;
  animation-delay: calc(var(--i) * -.25s / var(--k));
}

.ul-sp i:nth-child(2n) {
  background: var(--c2);
}

@keyframes ul-sp {
  0% {
    transform: rotate(0) translateX(calc(var(--s) * .65)) scale(1);
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  100% {
    transform: rotate(540deg) translateX(0) scale(.2);
    opacity: 0;
  }
}
```

### React

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

const css = `
.ul-sp {
  position: relative;
  width: calc(var(--s) * 1.3);
  height: calc(var(--s) * 1.3);
}

.ul-sp i {
  position: absolute;
  left: 50%;
  top: 50%;
  width: calc(var(--s) / 8);
  height: calc(var(--s) / 8);
  margin: calc(var(--s) / -16);
  border-radius: 50%;
  background: var(--c1);
  opacity: 0;
  animation: ul-sp calc(2.5s / var(--k)) cubic-bezier(.4,0,.6,1) infinite;
  animation-delay: calc(var(--i) * -.25s / var(--k));
}

.ul-sp i:nth-child(2n) {
  background: var(--c2);
}

@keyframes ul-sp {
  0% {
    transform: rotate(0) translateX(calc(var(--s) * .65)) scale(1);
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  100% {
    transform: rotate(540deg) translateX(0) scale(.2);
    opacity: 0;
  }
}
`;

export default function LoaderSpiral() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "72px",
          "--k": "1",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="ul-sp"><i style={{ "--i": "0" } as CSSProperties}></i><i style={{ "--i": "1" } as CSSProperties}></i><i style={{ "--i": "2" } as CSSProperties}></i><i style={{ "--i": "3" } as CSSProperties}></i><i style={{ "--i": "4" } as CSSProperties}></i><i style={{ "--i": "5" } as CSSProperties}></i><i style={{ "--i": "6" } as CSSProperties}></i><i style={{ "--i": "7" } as CSSProperties}></i><i style={{ "--i": "8" } as CSSProperties}></i><i style={{ "--i": "9" } as CSSProperties}></i></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 “Spiral to center loader” block (Loaders) from AIMRAN Library to my project.

## What it is
Dots that swirl inward in a tightening spiral, shrinking and fading as they reach the middle.

## 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-sp {
  position: relative;
  width: calc(var(--s) * 1.3);
  height: calc(var(--s) * 1.3);
}

.ul-sp i {
  position: absolute;
  left: 50%;
  top: 50%;
  width: calc(var(--s) / 8);
  height: calc(var(--s) / 8);
  margin: calc(var(--s) / -16);
  border-radius: 50%;
  background: var(--c1);
  opacity: 0;
  animation: ul-sp calc(2.5s / var(--k)) cubic-bezier(.4,0,.6,1) infinite;
  animation-delay: calc(var(--i) * -.25s / var(--k));
}

.ul-sp i:nth-child(2n) {
  background: var(--c2);
}

@keyframes ul-sp {
  0% {
    transform: rotate(0) translateX(calc(var(--s) * .65)) scale(1);
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  100% {
    transform: rotate(540deg) translateX(0) scale(.2);
    opacity: 0;
  }
}
`;

export default function LoaderSpiral() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "72px",
          "--k": "1",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="ul-sp"><i style={{ "--i": "0" } as CSSProperties}></i><i style={{ "--i": "1" } as CSSProperties}></i><i style={{ "--i": "2" } as CSSProperties}></i><i style={{ "--i": "3" } as CSSProperties}></i><i style={{ "--i": "4" } as CSSProperties}></i><i style={{ "--i": "5" } as CSSProperties}></i><i style={{ "--i": "6" } as CSSProperties}></i><i style={{ "--i": "7" } as CSSProperties}></i><i style={{ "--i": "8" } as CSSProperties}></i><i style={{ "--i": "9" } as CSSProperties}></i></div>
      </div>
    </>
  );
}
```

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