# Sliding pill filter chips

> Filter chips with a coloured pill that glides to the option you pick and resizes to fit the label.

- Category: [Filters](https://library.aimran.es/components/filters)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-f-chips-slide
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

These chips suit a portfolio that mixes kinds of work: a studio showing branding, web, photography and video on the same page. Visitors tap a category and the pill slides over, so it is always clear what they are looking at. If you came looking for animated filter chips in HTML and CSS, this is the simple version.

Keep the labels short, one or two words each, or the row wraps and the pill loses its path. Five or six categories is about the limit. Past that, a dropdown will serve people better than a long line of chips.

## Code

### HTML

```html
<div class="uv-fcs"><button class="on">All</button><button>Design</button><button>Code</button><button>Photos</button><button>Video</button><span class="p"></span></div>
```

### CSS

```css
.uv-fcs {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 16px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --fg: #1d1d1f;
  /* texto */
  --bg: #f5f5f7;
  /* fondo */
}

.uv-fcs {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  display: flex;
  gap: .2em;
  padding: .35em;
  border-radius: 999px;
  background: color-mix(in srgb,var(--fg) 7%,transparent);
}

.uv-fcs button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  line-height: 1;
  padding: .72em 1.25em;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  position: relative;
  transition: color calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  z-index: 1;
}

.uv-fcs button.on {
  color: #fff;
}

.uv-fcs button:not(.on):hover {
  color: var(--c1);
}

.uv-fcs .p {
  position: absolute;
  top: .35em;
  left: 0;
  height: calc(100% - .7em);
  border-radius: 999px;
  background: var(--c1);
  box-shadow: 0 6px 18px color-mix(in srgb,var(--c1) 40%,transparent);
  transition: transform calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1),width calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}
```

### JavaScript

```js
document.querySelectorAll(".uv-fcs").forEach(el => {
  const p=el.querySelector(".p"),bs=[...el.querySelectorAll("button")];const mv=b=>{p.style.width=b.offsetWidth+"px";p.style.transform="translateX("+b.offsetLeft+"px)"};bs.forEach(b=>b.addEventListener("click",()=>{bs.forEach(x=>x.classList.remove("on"));b.classList.add("on");mv(b)}));requestAnimationFrame(()=>mv(el.querySelector("button.on")))
});
```

### React

```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-fcs {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  display: flex;
  gap: .2em;
  padding: .35em;
  border-radius: 999px;
  background: color-mix(in srgb,var(--fg) 7%,transparent);
}

.uv-fcs button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  line-height: 1;
  padding: .72em 1.25em;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  position: relative;
  transition: color calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  z-index: 1;
}

.uv-fcs button.on {
  color: #fff;
}

.uv-fcs button:not(.on):hover {
  color: var(--c1);
}

.uv-fcs .p {
  position: absolute;
  top: .35em;
  left: 0;
  height: calc(100% - .7em);
  border-radius: 999px;
  background: var(--c1);
  box-shadow: 0 6px 18px color-mix(in srgb,var(--c1) 40%,transparent);
  transition: transform calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1),width calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  const p=el.querySelector(".p"),bs=[...el.querySelectorAll("button")];const mv=b=>{p.style.width=b.offsetWidth+"px";p.style.transform="translateX("+b.offsetLeft+"px)"};bs.forEach(b=>b.addEventListener("click",()=>{bs.forEach(x=>x.classList.remove("on"));b.classList.add("on");mv(b)}));requestAnimationFrame(()=>mv(el.querySelector("button.on")))
}

export default function FChipsSlide() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-fcs"><button className="on">All</button><button>Design</button><button>Code</button><button>Photos</button><button>Video</button><span className="p"></span></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 “Sliding pill filter chips” block (Filters) from AIMRAN Library to my project.

## What it is
Filter chips with a coloured pill that glides to the option you pick and resizes to fit the label.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- 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
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-fcs {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  display: flex;
  gap: .2em;
  padding: .35em;
  border-radius: 999px;
  background: color-mix(in srgb,var(--fg) 7%,transparent);
}

.uv-fcs button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  line-height: 1;
  padding: .72em 1.25em;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  position: relative;
  transition: color calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  z-index: 1;
}

.uv-fcs button.on {
  color: #fff;
}

.uv-fcs button:not(.on):hover {
  color: var(--c1);
}

.uv-fcs .p {
  position: absolute;
  top: .35em;
  left: 0;
  height: calc(100% - .7em);
  border-radius: 999px;
  background: var(--c1);
  box-shadow: 0 6px 18px color-mix(in srgb,var(--c1) 40%,transparent);
  transition: transform calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1),width calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  const p=el.querySelector(".p"),bs=[...el.querySelectorAll("button")];const mv=b=>{p.style.width=b.offsetWidth+"px";p.style.transform="translateX("+b.offsetLeft+"px)"};bs.forEach(b=>b.addEventListener("click",()=>{bs.forEach(x=>x.classList.remove("on"));b.classList.add("on");mv(b)}));requestAnimationFrame(()=>mv(el.querySelector("button.on")))
}

export default function FChipsSlide() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-fcs"><button className="on">All</button><button>Design</button><button>Code</button><button>Photos</button><button>Video</button><span className="p"></span></div>
      </div>
    </>
  );
}
```

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