# Circle fill checkbox

> A gradient circle grows from the middle until it fills the box, then the tick appears on top.

- Category: [Checkboxes](https://library.aimran.es/components/checkboxes)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-ck2-circle
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

Picture the “Remember me” box under a login form, or the “Save my details for next time” option in a checkout. Small, quiet choices like these suit a fill that grows from the centre: it has a bit of colour and softness without shouting. If you are looking for a CSS checkbox with a gradient, this is it.

The gradient uses two colours, so pick a pair that sit close together, like two blues or a pink and an orange. Strong opposites look muddy at this small size.

## Code

### HTML

```html
<label class="uv-ck2c"><input type="checkbox"><span class="bx"><i></i><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12.5l4.5 4.5L19 7.5" pathLength="1"/></svg></span>Remember me</label>
```

### CSS

```css
.uv-ck2c {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 16px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --fg: #1d1d1f;
  /* texto */
  --bg: #f5f5f7;
  /* fondo */
}

.uv-ck2c {
  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: inline-flex;
  align-items: center;
  gap: .7em;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
}

.uv-ck2c input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.uv-ck2c .bx {
  position: relative;
  display: grid;
  place-items: center;
  width: 1.5em;
  height: 1.5em;
  border-radius: .45em;
  overflow: hidden;
  box-shadow: inset 0 0 0 2px color-mix(in srgb,var(--fg) 22%,transparent);
  transition: box-shadow calc(0.25s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-ck2c i {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 150%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(135deg,var(--c1),var(--c2));
  scale: 0;
  transition: scale calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-ck2c svg {
  position: relative;
  width: 1em;
  height: 1em;
  color: #fff;
}

.uv-ck2c svg path {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1) calc(0.12s / var(--k));
}

.uv-ck2c:hover .bx {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2c input:checked + .bx {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2c input:checked + .bx i {
  scale: 1;
}

.uv-ck2c input:checked + .bx svg path {
  stroke-dashoffset: 0;
}
```

### React

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

const css = `
.uv-ck2c {
  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: inline-flex;
  align-items: center;
  gap: .7em;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
}

.uv-ck2c input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.uv-ck2c .bx {
  position: relative;
  display: grid;
  place-items: center;
  width: 1.5em;
  height: 1.5em;
  border-radius: .45em;
  overflow: hidden;
  box-shadow: inset 0 0 0 2px color-mix(in srgb,var(--fg) 22%,transparent);
  transition: box-shadow calc(0.25s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-ck2c i {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 150%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(135deg,var(--c1),var(--c2));
  scale: 0;
  transition: scale calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-ck2c svg {
  position: relative;
  width: 1em;
  height: 1em;
  color: #fff;
}

.uv-ck2c svg path {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1) calc(0.12s / var(--k));
}

.uv-ck2c:hover .bx {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2c input:checked + .bx {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2c input:checked + .bx i {
  scale: 1;
}

.uv-ck2c input:checked + .bx svg path {
  stroke-dashoffset: 0;
}
`;

export default function Ck2Circle() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-ck2c"><input type="checkbox" /><span className="bx"><i></i><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="3" strokeLinecap="round" strokeLinejoin="round"><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 “Circle fill checkbox” block (Checkboxes) from AIMRAN Library to my project.

## What it is
A gradient circle grows from the middle until it fills the box, then the tick appears on top.

## 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-ck2c {
  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: inline-flex;
  align-items: center;
  gap: .7em;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
}

.uv-ck2c input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.uv-ck2c .bx {
  position: relative;
  display: grid;
  place-items: center;
  width: 1.5em;
  height: 1.5em;
  border-radius: .45em;
  overflow: hidden;
  box-shadow: inset 0 0 0 2px color-mix(in srgb,var(--fg) 22%,transparent);
  transition: box-shadow calc(0.25s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-ck2c i {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 150%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(135deg,var(--c1),var(--c2));
  scale: 0;
  transition: scale calc(0.42s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-ck2c svg {
  position: relative;
  width: 1em;
  height: 1em;
  color: #fff;
}

.uv-ck2c svg path {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1) calc(0.12s / var(--k));
}

.uv-ck2c:hover .bx {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2c input:checked + .bx {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2c input:checked + .bx i {
  scale: 1;
}

.uv-ck2c input:checked + .bx svg path {
  stroke-dashoffset: 0;
}
`;

export default function Ck2Circle() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-ck2c"><input type="checkbox" /><span className="bx"><i></i><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="3" strokeLinecap="round" strokeLinejoin="round"><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.
````