# Gradient flip checkbox

> The box turns over in 3D and shows its back face, a gradient square with the tick.

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

## Where to use it

A flip is fun for optional extras you pick one by one: “Add breakfast” when booking a hotel room, gift wrapping in a shop checkout or toppings on a pizza builder. Each box turns like a card, so you see at a glance which extras are on. A 3D checkbox in CSS.

The flip takes a little longer than a normal tick, so it suits short lists better than long settings pages. Try a slower speed if your brand feels calm, or a faster one for something more playful.

## Code

### HTML

```html
<label class="uv-ck2f"><input type="checkbox"><span class="bx"><i class="fr"></i><i class="bk"><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></i></span>Turn on 3D</label>
```

### CSS

```css
.uv-ck2f {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 16px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --fg: #1d1d1f;
  /* texto */
  --bg: #f5f5f7;
  /* fondo */
}

.uv-ck2f {
  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-ck2f input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.uv-ck2f .bx {
  position: relative;
  width: 1.6em;
  height: 1.6em;
  transform-style: preserve-3d;
  transition: transform calc(0.55s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-ck2f i {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: .45em;
  backface-visibility: hidden;
}

.uv-ck2f .fr {
  box-shadow: inset 0 0 0 2px color-mix(in srgb,var(--fg) 22%,transparent);
}

.uv-ck2f .bk {
  transform: rotateY(180deg);
  background: linear-gradient(135deg,var(--c1),var(--c2));
  box-shadow: 0 5px 14px color-mix(in srgb,var(--c1) 40%,transparent);
}

.uv-ck2f svg {
  width: 1em;
  height: 1em;
  color: #fff;
}

.uv-ck2f:hover .fr {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2f input:checked + .bx {
  transform: rotateY(180deg);
}
```

### React

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

const css = `
.uv-ck2f {
  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-ck2f input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.uv-ck2f .bx {
  position: relative;
  width: 1.6em;
  height: 1.6em;
  transform-style: preserve-3d;
  transition: transform calc(0.55s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-ck2f i {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: .45em;
  backface-visibility: hidden;
}

.uv-ck2f .fr {
  box-shadow: inset 0 0 0 2px color-mix(in srgb,var(--fg) 22%,transparent);
}

.uv-ck2f .bk {
  transform: rotateY(180deg);
  background: linear-gradient(135deg,var(--c1),var(--c2));
  box-shadow: 0 5px 14px color-mix(in srgb,var(--c1) 40%,transparent);
}

.uv-ck2f svg {
  width: 1em;
  height: 1em;
  color: #fff;
}

.uv-ck2f:hover .fr {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2f input:checked + .bx {
  transform: rotateY(180deg);
}
`;

export default function Ck2Flip() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-ck2f"><input type="checkbox" /><span className="bx"><i className="fr"></i><i className="bk"><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></i></span>Turn on 3D</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 “Gradient flip checkbox” block (Checkboxes) from AIMRAN Library to my project.

## What it is
The box turns over in 3D and shows its back face, a gradient square with the tick.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- Speed: 1x (from 0.5 to 2x)
- Text: "Turn on 3D"

## 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-ck2f {
  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-ck2f input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.uv-ck2f .bx {
  position: relative;
  width: 1.6em;
  height: 1.6em;
  transform-style: preserve-3d;
  transition: transform calc(0.55s / var(--k)) cubic-bezier(.34,1.56,.64,1);
}

.uv-ck2f i {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: .45em;
  backface-visibility: hidden;
}

.uv-ck2f .fr {
  box-shadow: inset 0 0 0 2px color-mix(in srgb,var(--fg) 22%,transparent);
}

.uv-ck2f .bk {
  transform: rotateY(180deg);
  background: linear-gradient(135deg,var(--c1),var(--c2));
  box-shadow: 0 5px 14px color-mix(in srgb,var(--c1) 40%,transparent);
}

.uv-ck2f svg {
  width: 1em;
  height: 1em;
  color: #fff;
}

.uv-ck2f:hover .fr {
  box-shadow: inset 0 0 0 2px var(--c1);
}

.uv-ck2f input:checked + .bx {
  transform: rotateY(180deg);
}
`;

export default function Ck2Flip() {
  return (
    <>
      <style>{css}</style>
      <div
        style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-ck2f"><input type="checkbox" /><span className="bx"><i className="fr"></i><i className="bk"><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></i></span>Turn on 3D</label>
      </div>
    </>
  );
}
```

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