# Liquid fill loader

> A round glass that fills up with a gently rolling wave until it is full, then empties and starts again.

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

## Where to use it

Filling up is an easy metaphor to read: water in a glass, charge in a battery, coffee in a cup. Use this liquid fill loader in a hydration tracker, on the charging screen of an electric car app or while a café’s ordering site prepares your drink. Two wave layers roll at different speeds, which keeps the surface looking alive.

Give it room at a medium or large size, so the wave is visible. A short line underneath, like “Brewing your order”, turns it from a generic spinner into a small moment. The second color sits behind the first, so a lighter tint of the main color works well.

## Code

### HTML

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

### CSS

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

.ul-wv {
  position: relative;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  border: calc(var(--s) / 22) solid var(--c1);
  overflow: hidden;
  padding: 3px;
  background-clip: content-box;
}

.ul-wv::before,.ul-wv::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 220%;
  aspect-ratio: 1;
  border-radius: 42%;
  background: var(--c1);
  animation: ul-wv-r calc(3s / var(--k)) linear infinite,ul-wv-u calc(4s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

.ul-wv::after {
  background: var(--c2);
  opacity: .6;
  border-radius: 38%;
  animation-duration: calc(4.5s / var(--k)),calc(4s / var(--k));
}

@keyframes ul-wv-r {
  from {
    transform: translateX(-50%) rotate(0);
  }
  to {
    transform: translateX(-50%) rotate(360deg);
  }
}

@keyframes ul-wv-u {
  0% {
    top: 100%;
  }
  85%,100% {
    top: -125%;
  }
}
```

### React

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

const css = `
.ul-wv {
  position: relative;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  border: calc(var(--s) / 22) solid var(--c1);
  overflow: hidden;
  padding: 3px;
  background-clip: content-box;
}

.ul-wv::before,.ul-wv::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 220%;
  aspect-ratio: 1;
  border-radius: 42%;
  background: var(--c1);
  animation: ul-wv-r calc(3s / var(--k)) linear infinite,ul-wv-u calc(4s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

.ul-wv::after {
  background: var(--c2);
  opacity: .6;
  border-radius: 38%;
  animation-duration: calc(4.5s / var(--k)),calc(4s / var(--k));
}

@keyframes ul-wv-r {
  from {
    transform: translateX(-50%) rotate(0);
  }
  to {
    transform: translateX(-50%) rotate(360deg);
  }
}

@keyframes ul-wv-u {
  0% {
    top: 100%;
  }
  85%,100% {
    top: -125%;
  }
}
`;

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

## What it is
A round glass that fills up with a gently rolling wave until it is full, then empties and starts again.

## 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-wv {
  position: relative;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  border: calc(var(--s) / 22) solid var(--c1);
  overflow: hidden;
  padding: 3px;
  background-clip: content-box;
}

.ul-wv::before,.ul-wv::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 220%;
  aspect-ratio: 1;
  border-radius: 42%;
  background: var(--c1);
  animation: ul-wv-r calc(3s / var(--k)) linear infinite,ul-wv-u calc(4s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

.ul-wv::after {
  background: var(--c2);
  opacity: .6;
  border-radius: 38%;
  animation-duration: calc(4.5s / var(--k)),calc(4s / var(--k));
}

@keyframes ul-wv-r {
  from {
    transform: translateX(-50%) rotate(0);
  }
  to {
    transform: translateX(-50%) rotate(360deg);
  }
}

@keyframes ul-wv-u {
  0% {
    top: 100%;
  }
  85%,100% {
    top: -125%;
  }
}
`;

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

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