# checkmarkBackgroundUssClassName

> USS class name of checkmark background in RadioButton elements.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.UIElements](/engine/6000.5/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
public static readonly string checkmarkBackgroundUssClassName
```

### Remarks

Unity adds this USS class to the checkmark background sub-element of the [RadioButton](/engine/6000.5/script-reference/unityengine/uielements/radiobutton.md).