# CSS: The value is out of range.This value must be between “0” and “100”'.

> Canonical HTML version: https://rocketvalidator.com/html-validation/css-the-value-is-out-of-range-this-value-must-be-between-0-and-100
> Attribution: Rocket Validator (https://rocketvalidator.com)
> License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

A percentage value in your CSS exceeds the allowed range of `0` to `100`.

CSS properties that accept percentage values — such as `opacity`, `width`, `height`, and others used in certain contexts — may be restricted to specific ranges. When you embed CSS in an HTML document (via the `style` attribute or a `<style>` element), the W3C HTML Validator checks these values and flags any that fall outside the permitted range.

A value like `100.01%` is just slightly over the maximum of `100%`. This is often a typo or a rounding error. While most browsers will silently clamp the value to `100%`, it is still invalid and should be corrected.

## HTML Examples

### ❌ Invalid: value out of range

```html
<div style="width: 100.01%;">Content</div>
```

### ✅ Fixed: value within range

```html
<div style="width: 100%;">Content</div>
```