# Round fill checkbox

> A round checkbox that fills from the center outwards, then pops a white tick in the middle.

- Category: [Checkboxes](https://library.aimran.es/components/checkboxes)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-chk-circle
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

Round checkboxes feel softer and more mobile-friendly than square ones. This one works well for “Remember me” under a login form, for picking toppings in a pizza ordering app or for marking lessons as seen in a course. The color grows from the center like a drop of ink, and the tick follows with a little spring.

Circles are often read as radio buttons, where only one option can be chosen. Use this style for a single choice like “Remember me”, or in lists where the labels make it obvious that several can be ticked.

## Code

### HTML

```html
<label class="uv-cc"><input type="checkbox" checked><span><svg viewBox="0 0 24 24"><path d="M5 12.5l4.5 4.5L19 7.5" pathLength="1"/></svg></span>Remember me</label>
```

### CSS

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

.uv-cc {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  display: inline-flex;
  align-items: center;
  gap: .7em;
  font-size: var(--s);
  color: var(--fg);
  cursor: pointer;
}

.uv-cc input {
  display: none;
}

.uv-cc span {
  position: relative;
  display: grid;
  place-items: center;
  width: 1.6em;
  height: 1.6em;
  overflow: hidden;
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-cc span::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--c1);
  transform: scale(0);
  transition: transform calc(0.4s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-cc svg {
  position: relative;
  width: 60%;
  fill: none;
  stroke: #fff;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  transform: scale(0);
  transition: transform calc(0.3s / var(--k)) cubic-bezier(.34,1.56,.64,1) calc(0.15s / var(--k));
}

.uv-cc input:checked+span::before,.uv-cc input:checked+span svg {
  transform: scale(1);
}
```

### React

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

const css = `
.uv-cc {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  display: inline-flex;
  align-items: center;
  gap: .7em;
  font-size: var(--s);
  color: var(--fg);
  cursor: pointer;
}

.uv-cc input {
  display: none;
}

.uv-cc span {
  position: relative;
  display: grid;
  place-items: center;
  width: 1.6em;
  height: 1.6em;
  overflow: hidden;
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-cc span::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--c1);
  transform: scale(0);
  transition: transform calc(0.4s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-cc svg {
  position: relative;
  width: 60%;
  fill: none;
  stroke: #fff;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  transform: scale(0);
  transition: transform calc(0.3s / var(--k)) cubic-bezier(.34,1.56,.64,1) calc(0.15s / var(--k));
}

.uv-cc input:checked+span::before,.uv-cc input:checked+span svg {
  transform: scale(1);
}
`;

export default function ChkCircle() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-cc"><input type="checkbox" checked={true} /><span><svg viewBox="0 0 24 24"><path d="M5 12.5l4.5 4.5L19 7.5" pathLength="1" /></svg></span>Remember me</label>
      </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 “Round fill checkbox” block (Checkboxes) from AIMRAN Library to my project.

## What it is
A round checkbox that fills from the center outwards, then pops a white tick in the middle.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- Speed: 1x (from 0.5 to 2x)
- Text: "Remember me"

## 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 = `
.uv-cc {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  display: inline-flex;
  align-items: center;
  gap: .7em;
  font-size: var(--s);
  color: var(--fg);
  cursor: pointer;
}

.uv-cc input {
  display: none;
}

.uv-cc span {
  position: relative;
  display: grid;
  place-items: center;
  width: 1.6em;
  height: 1.6em;
  overflow: hidden;
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-cc span::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--c1);
  transform: scale(0);
  transition: transform calc(0.4s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-cc svg {
  position: relative;
  width: 60%;
  fill: none;
  stroke: #fff;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  transform: scale(0);
  transition: transform calc(0.3s / var(--k)) cubic-bezier(.34,1.56,.64,1) calc(0.15s / var(--k));
}

.uv-cc input:checked+span::before,.uv-cc input:checked+span svg {
  transform: scale(1);
}
`;

export default function ChkCircle() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-cc"><input type="checkbox" checked={true} /><span><svg viewBox="0 0 24 24"><path d="M5 12.5l4.5 4.5L19 7.5" pathLength="1" /></svg></span>Remember me</label>
      </div>
    </>
  );
}
```

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