# Size selector

> Round size buttons that fill with a bounce; a sold-out size is struck through and can't be picked.

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

## Where to use it

Every clothing or trainer shop needs one on the product page. The chosen size fills with colour and a small bounce, while a sold-out size stays visible but crossed out, which is more honest than hiding it. A size guide link sits underneath for the undecided. It covers what most people mean by a size picker for e-commerce.

Circles work for letter sizes like XS to XL. Shoe sizes with halves, like 42.5, need wider pills. Keep the size guide close; it quietly cuts down on returns, which any shop owner will appreciate.

## Code

### HTML

```html
<div class="uv-fsz"><div class="tt">Size</div><div class="rw"><button class="">XS</button><button class="">S</button><button class="on">M</button><button class="">L</button><button class=" off" disabled>XL</button></div><div class="gs">Size guide</div></div>
```

### CSS

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

.uv-fsz {
  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;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .9em;
}

.uv-fsz .tt {
  font-size: calc(var(--s) * .8);
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  opacity: .45;
}

.uv-fsz .rw {
  display: flex;
  gap: .6em;
}

.uv-fsz 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),background calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  width: 3em;
  height: 3em;
  padding: 0;
  display: grid;
  place-items: center;
  font-weight: 650;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1.5px color-mix(in srgb,var(--fg) 16%,transparent);
}

.uv-fsz button:hover:not(.off) {
  box-shadow: inset 0 0 0 1.5px var(--c1);
  color: var(--c1);
  transform: translateY(-2px);
}

.uv-fsz button.on {
  color: #fff;
  background: var(--c1);
  box-shadow: inset 0 0 0 1.5px var(--c1),0 8px 18px color-mix(in srgb,var(--c1) 34%,transparent);
  animation: uv-fsz calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-fsz button.off {
  opacity: .35;
  cursor: not-allowed;
  text-decoration: line-through;
}

.uv-fsz .gs {
  font-size: calc(var(--s) * .78);
  color: var(--c1);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

@keyframes uv-fsz {
  0% {
    scale: 1;
  }
  40% {
    scale: 1.22;
  }
  70% {
    scale: .95;
  }
  100% {
    scale: 1;
  }
}
```

### JavaScript

```js
document.querySelectorAll(".uv-fsz").forEach(el => {
  el.querySelectorAll("button").forEach(b=>b.addEventListener("click",()=>{if(b.classList.contains("off"))return;el.querySelectorAll("button").forEach(x=>x.classList.remove("on"));b.classList.add("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-fsz {
  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;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .9em;
}

.uv-fsz .tt {
  font-size: calc(var(--s) * .8);
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  opacity: .45;
}

.uv-fsz .rw {
  display: flex;
  gap: .6em;
}

.uv-fsz 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),background calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  width: 3em;
  height: 3em;
  padding: 0;
  display: grid;
  place-items: center;
  font-weight: 650;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1.5px color-mix(in srgb,var(--fg) 16%,transparent);
}

.uv-fsz button:hover:not(.off) {
  box-shadow: inset 0 0 0 1.5px var(--c1);
  color: var(--c1);
  transform: translateY(-2px);
}

.uv-fsz button.on {
  color: #fff;
  background: var(--c1);
  box-shadow: inset 0 0 0 1.5px var(--c1),0 8px 18px color-mix(in srgb,var(--c1) 34%,transparent);
  animation: uv-fsz calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-fsz button.off {
  opacity: .35;
  cursor: not-allowed;
  text-decoration: line-through;
}

.uv-fsz .gs {
  font-size: calc(var(--s) * .78);
  color: var(--c1);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

@keyframes uv-fsz {
  0% {
    scale: 1;
  }
  40% {
    scale: 1.22;
  }
  70% {
    scale: .95;
  }
  100% {
    scale: 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) {
  el.querySelectorAll("button").forEach(b=>b.addEventListener("click",()=>{if(b.classList.contains("off"))return;el.querySelectorAll("button").forEach(x=>x.classList.remove("on"));b.classList.add("on")}))
}

export default function FMobSize() {
  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-fsz"><div className="tt">Size</div><div className="rw"><button className="">XS</button><button className="">S</button><button className="on">M</button><button className="">L</button><button className=" off" disabled={true}>XL</button></div><div className="gs">Size guide</div></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 “Size selector” block (Filters) from AIMRAN Library to my project.

## What it is
Round size buttons that fill with a bounce; a sold-out size is struck through and can't be picked.

## 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-fsz {
  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;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .9em;
}

.uv-fsz .tt {
  font-size: calc(var(--s) * .8);
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  opacity: .45;
}

.uv-fsz .rw {
  display: flex;
  gap: .6em;
}

.uv-fsz 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),background calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  width: 3em;
  height: 3em;
  padding: 0;
  display: grid;
  place-items: center;
  font-weight: 650;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1.5px color-mix(in srgb,var(--fg) 16%,transparent);
}

.uv-fsz button:hover:not(.off) {
  box-shadow: inset 0 0 0 1.5px var(--c1);
  color: var(--c1);
  transform: translateY(-2px);
}

.uv-fsz button.on {
  color: #fff;
  background: var(--c1);
  box-shadow: inset 0 0 0 1.5px var(--c1),0 8px 18px color-mix(in srgb,var(--c1) 34%,transparent);
  animation: uv-fsz calc(0.45s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-fsz button.off {
  opacity: .35;
  cursor: not-allowed;
  text-decoration: line-through;
}

.uv-fsz .gs {
  font-size: calc(var(--s) * .78);
  color: var(--c1);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

@keyframes uv-fsz {
  0% {
    scale: 1;
  }
  40% {
    scale: 1.22;
  }
  70% {
    scale: .95;
  }
  100% {
    scale: 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) {
  el.querySelectorAll("button").forEach(b=>b.addEventListener("click",()=>{if(b.classList.contains("off"))return;el.querySelectorAll("button").forEach(x=>x.classList.remove("on"));b.classList.add("on")}))
}

export default function FMobSize() {
  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-fsz"><div className="tt">Size</div><div className="rw"><button className="">XS</button><button className="">S</button><button className="on">M</button><button className="">L</button><button className=" off" disabled={true}>XL</button></div><div className="gs">Size guide</div></div>
      </div>
    </>
  );
}
```

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