# Striped progress bar

> A progress bar with moving diagonal stripes that fills up, resets and fills again.

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

## Where to use it

Moving stripes have a busy, work-in-progress look, a bit like caution tape. That makes this striped progress bar in CSS a natural fit for the maintenance page of an online shop, the backup step of a website builder or the download screen of an installer. The stripes keep crawling even while the fill takes its time.

Out of the box the fill loops, so it sets a mood rather than showing a real percentage. If you know the actual progress, drop the filling animation, set the width yourself and keep the moving stripes. High-contrast stripes can buzz; softer pairs are kinder on the eyes.

## Code

### HTML

```html
<div class="ul-st"><i></i></div>
```

### CSS

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

.ul-st {
  width: calc(var(--s) * 4);
  height: calc(var(--s) / 4);
  border-radius: 99px;
  background: color-mix(in srgb,var(--c1) 12%,transparent);
  overflow: hidden;
}

.ul-st i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: repeating-linear-gradient(-45deg,var(--c1) 0 10px,var(--c2) 10px 20px);
  background-size: 28.28px 100%;
  animation: ul-st-m calc(0.6s / var(--k)) linear infinite,ul-st-w calc(3s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-st-m {
  to {
    background-position: 28.28px 0;
  }
}

@keyframes ul-st-w {
  0% {
    width: 0;
  }
  80%,100% {
    width: 100%;
  }
}
```

### React

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

const css = `
.ul-st {
  width: calc(var(--s) * 4);
  height: calc(var(--s) / 4);
  border-radius: 99px;
  background: color-mix(in srgb,var(--c1) 12%,transparent);
  overflow: hidden;
}

.ul-st i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: repeating-linear-gradient(-45deg,var(--c1) 0 10px,var(--c2) 10px 20px);
  background-size: 28.28px 100%;
  animation: ul-st-m calc(0.6s / var(--k)) linear infinite,ul-st-w calc(3s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-st-m {
  to {
    background-position: 28.28px 0;
  }
}

@keyframes ul-st-w {
  0% {
    width: 0;
  }
  80%,100% {
    width: 100%;
  }
}
`;

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

## What it is
A progress bar with moving diagonal stripes that fills up, resets and fills 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-st {
  width: calc(var(--s) * 4);
  height: calc(var(--s) / 4);
  border-radius: 99px;
  background: color-mix(in srgb,var(--c1) 12%,transparent);
  overflow: hidden;
}

.ul-st i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: repeating-linear-gradient(-45deg,var(--c1) 0 10px,var(--c2) 10px 20px);
  background-size: 28.28px 100%;
  animation: ul-st-m calc(0.6s / var(--k)) linear infinite,ul-st-w calc(3s / var(--k)) cubic-bezier(.65,0,.35,1) infinite;
}

@keyframes ul-st-m {
  to {
    background-position: 28.28px 0;
  }
}

@keyframes ul-st-w {
  0% {
    width: 0;
  }
  80%,100% {
    width: 100%;
  }
}
`;

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