# backdropSepia

> Shifts what shows through the element's translucent background toward a warm brown monochrome.

```ts
import { backdropSepia } from "@sdxc/u/effects";
```

Shifts what shows through the element's translucent background toward a warm
brown monochrome. Composes with every other backdrop utility; wrap in
`u.transparencySafe()` for a solid fallback.

## Quick reference

Every documented call, beside the CSS it emits.

| Call | CSS |
| --- | --- |
| `u.backdropSepia()` | `css({ "--ui-backdrop-sepia": "1", backdropFilter: "... sepia(var(--ui-backdrop-sepia, 0))", WebkitBackdropFilter: "... sepia(var(--ui-backdrop-sepia, 0))" })` |
| `u.transparencySafe(u.backdropSepia(0.6))` | `css({ "@media (prefers-reduced-transparency: no-preference)": { "--ui-backdrop-sepia": "0.6", backdropFilter: "...", WebkitBackdropFilter: "..." } })` |

## Examples

### Basic example

Use `backdropSepia(n)` to tone what shows through an element toward warm brown, where `backdropSepia()` with no argument converts it fully:

```tsx
<div mix={[...]}>
	<div mix={[...]}>
		<div mix={[backdropSepia(0.5), ...]}>backdropSepia(0.5)</div>
	</div>
	<div mix={[...]}>
		<div mix={[backdropSepia(), ...]}>backdropSepia()</div>
	</div>
</div>
```

## Applying on a state

Wrap the call in a state utility to scope it to one selector.

```ts
u.hover(u.backdropSepia())
```

## Responsive design

Wrap the call in a container query to scope it to one width.

```ts
u.at("md", u.backdropSepia())
```

## Signature

```ts
u.backdropSepia(value?: number | (string & {}))
```