# Appearance

In this article, you will find information about the styling options and rendering of the Telerik UI for ASP.NET Core RadioButton.

For a live example, check out the [Appearance Demo of the RadioButton](https://demos.telerik.com/aspnet-core/radiobutton/appearance).

## Options

The `Size()` method controls how big or small the rendered radio input looks.

The example below demonstrates how to adjust the `Size` of the component:

```Razor HtmlHelper
@(Html.Kendo().RadioButton()
    .Name("radioBtn")
    .Checked(true)
    .Size(ComponentSize.Small)
)
```

```Razor TagHelper
<kendo-radiobutton name="radioBtn" checked="true" size="small"></kendo-radiobutton>
```

The following values are available for the `Size` option:

* `Small`
* `Medium`
* `Large`

> When not explicitly set, the applied theme controls the default size.

> The `None` value is deprecated. Use custom CSS instead.

## Rendering

Starting with version R1 2022, the component has a new rendering. For additional information on the decision behind these changes, visit the [Components Rendering Overview](https://www.telerik.com/aspnet-core-ui/documentation/styles-and-layout/components-rendering-overview) article.

To review the latest rendering of the component, refer to the HTML specifications in the [Kendo UI Themes Monorepo](https://github.com/telerik/kendo-themes/tree/develop). The `tests` folder of the repository contains the rendering for all flavors of the components, providing a clear reference for how their elements are structured. The rendering information can help you customize a component's appearance and behavior by applying custom CSS or JavaScript to suit specific design or functional requirements.

## See Also

* [Components Appearance Overview](https://www.telerik.com/aspnet-core-ui/documentation/styles-and-layout/components-rendering-overview)
* [Appearance of the RadioButton HtmlHelper for ASP.NET Core (Demo)](https://demos.telerik.com/aspnet-core/radiobutton/appearance)
* [RadioButton Server-Side API](https://www.telerik.com/aspnet-core-ui/documentation/api/radiobutton)