# Checkbox
> Real checkboxes, redrawn: ink grows from the centre and the tick draws itself. A select-all box shows a dash when only some are checked. Cards too.
Forms · checkbox, form, select-all, cards · HTML, CSS, vanilla JS · no dependencies · updated 2026-10-16
Demo: https://kodza.dev/components/checkbox-component/
## Files
The code below, served as files: byte for byte what the Kodza site copies (the CSS includes its theme guard).
- [`kodza-checkbox-component.css`](https://kodza.dev/registry/checkbox-component/kodza-checkbox-component.css) · 13.3 KB
- [`kodza-checkbox-component.js`](https://kodza.dev/registry/checkbox-component/kodza-checkbox-component.js) · 3.3 KB
- [`kodza-checkbox-component.html`](https://kodza.dev/registry/checkbox-component/kodza-checkbox-component.html) · 3.4 KB · the markup, to adapt and paste into your page
**Can you run shell commands? Download the CSS and the JS, don't retype them.** Retyping costs thousands of tokens and can drop or change lines of the CSS. Put the files where your stack expects them (Use it says where: change the `-o` paths):
```bash
curl -fsSL --create-dirs -o kodza/kodza-checkbox-component.css https://kodza.dev/registry/checkbox-component/kodza-checkbox-component.css
curl -fsSL --create-dirs -o kodza/kodza-checkbox-component.js https://kodza.dev/registry/checkbox-component/kodza-checkbox-component.js
```
Then load the files from your page as Use it shows, instead of pasting the content. The HTML is the part you adapt (text, links, modifiers): paste it from the Code section. Copy the CSS and the JS from the Code section only if you can't run commands, exactly as they are. (Windows PowerShell: `curl.exe`.)
## API
- Root: `.kodza-checkbox`
- Variables (set them on the root element itself: it declares its own defaults):
- `--kz-check-bg: #ffffff`
- `--kz-check-fg: #0a0a0a`
- `--kz-check-muted: rgba(10, 10, 10, 0.6)`
- `--kz-check-line: rgba(10, 10, 10, 0.2)`
- `--kz-check-soft: rgba(10, 10, 10, 0.06)`
- `--kz-check-ink: #0a0a0a`
- `--kz-check-on-ink: #ffffff`
- `--kz-check-size: 20px`
- `--kz-check-ease: cubic-bezier(0.22, 1, 0.36, 1)`
- `--kz-check-spring: cubic-bezier(0.34, 1.56, 0.64, 1)`
- Modifiers: `.kodza-checkbox--cards`
- Attributes:
- `data-all`
- Lifecycle: `kodza:init` / `kodza:destroy` on `document`, with `{ detail: { root } }` to target a container.
## Dark mode
The values Kodza uses on a dark background (`#0a0a0a`). For a page that follows the system theme, add them after the component's CSS:
```css
@media (prefers-color-scheme: dark) {
.kodza-checkbox {
--kz-check-bg: #161616;
--kz-check-fg: #f2f2f0;
--kz-check-muted: rgba(242, 242, 240, 0.62);
--kz-check-line: rgba(255, 255, 255, 0.24);
--kz-check-soft: rgba(255, 255, 255, 0.07);
--kz-check-ink: #f2f2f0;
--kz-check-on-ink: #0a0a0a;
}
}
```
A site with its own theme switch puts the same rules under its dark selector instead (`[data-theme="dark"] .kodza-checkbox { … }`); a single dark section, under that section's class.
## Use it
### Plain HTML page
- CSS: `kodza/kodza-checkbox-component.css` next to the page (the Files commands as they are), linked in ``: ``. Without a shell, paste it in a `