# Equalizer loader

> Five rounded bars rising and falling out of sync, like the level meter of a music player.

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

## Where to use it

An equalizer loader instantly says “audio”. Use it while a streaming site buffers a track, when a podcast player fetches an episode or while a voice memo app processes a recording. Shrink it down next to a song title and it also works as a “now playing” indicator in a playlist or a radio station’s web player.

Outside audio it can confuse people, since moving bars usually mean sound. If you use it as a playing indicator, stop or hide it when the music pauses. The bars fade from the second color to the main one, so a warm and cool pair looks lively.

## Code

### HTML

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

### CSS

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

.ul-eq {
  display: flex;
  align-items: center;
  gap: calc(var(--s) / 10);
  height: var(--s);
}

.ul-eq i {
  width: calc(var(--s) / 8);
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(var(--c2),var(--c1));
  animation: ul-eq calc(1s / var(--k)) ease-in-out infinite;
  animation-delay: calc(var(--i) * -.18s / var(--k));
}

.ul-eq i:nth-child(2n) {
  animation-duration: calc(0.8s / var(--k));
}

@keyframes ul-eq {
  0%,100% {
    transform: scaleY(.25);
  }
  50% {
    transform: scaleY(1);
  }
}
```

### React

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

const css = `
.ul-eq {
  display: flex;
  align-items: center;
  gap: calc(var(--s) / 10);
  height: var(--s);
}

.ul-eq i {
  width: calc(var(--s) / 8);
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(var(--c2),var(--c1));
  animation: ul-eq calc(1s / var(--k)) ease-in-out infinite;
  animation-delay: calc(var(--i) * -.18s / var(--k));
}

.ul-eq i:nth-child(2n) {
  animation-duration: calc(0.8s / var(--k));
}

@keyframes ul-eq {
  0%,100% {
    transform: scaleY(.25);
  }
  50% {
    transform: scaleY(1);
  }
}
`;

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

## What it is
Five rounded bars rising and falling out of sync, like the level meter of a music player.

## 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-eq {
  display: flex;
  align-items: center;
  gap: calc(var(--s) / 10);
  height: var(--s);
}

.ul-eq i {
  width: calc(var(--s) / 8);
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(var(--c2),var(--c1));
  animation: ul-eq calc(1s / var(--k)) ease-in-out infinite;
  animation-delay: calc(var(--i) * -.18s / var(--k));
}

.ul-eq i:nth-child(2n) {
  animation-duration: calc(0.8s / var(--k));
}

@keyframes ul-eq {
  0%,100% {
    transform: scaleY(.25);
  }
  50% {
    transform: scaleY(1);
  }
}
`;

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

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