# Square to circle loader

> A square that turns, shrinks into a circle and shifts color, then comes back, over and over.

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

## Where to use it

This morphing shape has a playful, designed feel, which is why it fits creative sites: the intro of a design studio, the loading screen of an online portfolio or a page transition on an architecture firm’s site. It is a pure CSS loader, a single element with no JavaScript, so it drops into any page.

Pick two colors that sit close together, like two blues or a coral and a pink, so the shift reads as a mood rather than a flash. It deserves some size; below 30 pixels the rotation turns into a twitch.

## Code

### HTML

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

### CSS

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

.ul-morph {
  width: var(--s);
  height: var(--s);
  background: var(--c1);
  animation: ul-morph calc(2s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-morph {
  0% {
    transform: rotate(0) scale(1);
    border-radius: 18%;
  }
  50% {
    transform: rotate(180deg) scale(.8);
    border-radius: 50%;
    background: var(--c2);
  }
  100% {
    transform: rotate(360deg) scale(1);
    border-radius: 18%;
  }
}
```

### React

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

const css = `
.ul-morph {
  width: var(--s);
  height: var(--s);
  background: var(--c1);
  animation: ul-morph calc(2s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-morph {
  0% {
    transform: rotate(0) scale(1);
    border-radius: 18%;
  }
  50% {
    transform: rotate(180deg) scale(.8);
    border-radius: 50%;
    background: var(--c2);
  }
  100% {
    transform: rotate(360deg) scale(1);
    border-radius: 18%;
  }
}
`;

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

## What it is
A square that turns, shrinks into a circle and shifts color, then comes back, over and over.

## 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-morph {
  width: var(--s);
  height: var(--s);
  background: var(--c1);
  animation: ul-morph calc(2s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-morph {
  0% {
    transform: rotate(0) scale(1);
    border-radius: 18%;
  }
  50% {
    transform: rotate(180deg) scale(.8);
    border-radius: 50%;
    background: var(--c2);
  }
  100% {
    transform: rotate(360deg) scale(1);
    border-radius: 18%;
  }
}
`;

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

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