---
title: "@stillwind-undef-arbitrary-property"
description: "Reject arbitrary-property utilities such as [color:red] for the properties that match a pattern."
image: "https://stillwind.dev/og.png"
---

> Documentation Index
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# @stillwind-undef-arbitrary-property

```css
@stillwind-undef-arbitrary-property property;
@stillwind-undef-arbitrary-property prefix-*;
@stillwind-undef-arbitrary-property *;
```

An arbitrary property is a utility that writes a declaration directly, such as
`[color:red]`. `@stillwind-undef-arbitrary-property` rejects arbitrary
properties for the matching CSS properties. A rejected candidate produces no
CSS. Write the statement at the top level of the stylesheet or in a
[@stillwind-registry](/docs/at-rules/stillwind-registry) block.

## Example

### Stylesheet

```css
@stillwind-undef-arbitrary-property *;
@stillwind-arbitrary-property --*;
```

### Source

```tsx
import { style } from "stillwind/react";

export const rejected = style("[color:red]");
export const accepted = style("[--gutter:1rem]");
```

### Compiled code

```ts
export const rejected = {};
export const accepted = {className:"sw_obysi"};
```

### Generated stylesheet without preflight

```css
/*! stillwind v0.0.0 | MIT License | https://stillwind.dev */
/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */
@layer properties, theme, base, components, utilities;

@layer utilities {
  .sw_obysi {
    --gutter: 1rem;
  }
}
```

The first statement rejects every property. The second statement accepts custom
properties again, so components can still set variables.

## Rules

- The last matching statement decides for each property. A property that no
  statement matches is accepted.
- `@stillwind-arbitrary-property pattern;` accepts the matching properties
  again. The [registry directives](/docs/at-rules/registry-directives) describe
  its other role.
- Patterns use the same forms as
  [@stillwind-undef-utility](/docs/at-rules/stillwind-undef-utility), with
  property names instead of utility names.

To report arbitrary values without rejecting them, use lint rules such as
[no-arbitrary-colors](/docs/lints/no-arbitrary-colors) or
[no-restricted-declarations](/docs/lints/no-restricted-declarations) instead.

Source: https://stillwind.dev/docs/at-rules/stillwind-undef-arbitrary-property/index.mdx