# Customize Widget CSS

{% hint style="info" %}
Available since widget version 1.10.0
{% endhint %}

In order to override the default CSS styles of the Chat bubble widget, the widget exposes a global function `Userdesk.setCustomCSS(<css string>)`.

To globally update the text settings use

```
Userdesk.setCustomCSS(`
  * {
    letter-spacing: 0.05em;
  }
`)
```

To update the settings of the header use

```
Userdesk.setCustomCSS(`
  .userdesk-header {
    letter-spacing: 0.1em;
  }
`)
```

To reset the CSS settings use

```
Userdesk.setCustomCSS(``)
```

{% hint style="info" %}
If you want to update multiple elements, you need to define all the styles.<br>

For instance:

```
Userdesk.setCustomCSS(`
  * {
    letter-spacing: 0.05em;
  }

  .userdesk-header {
    letter-spacing: 0.1em;
  }
`)
```

{% endhint %}

## CSS classes

These are the classes currently present

<figure><img src="/files/r1FOA0OX1pjss6YzdFMA" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/8rOMEjpGEYYoH3thkYdZ" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.userdesk.io/product-guides/customize-widget-css.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.