# Styling the AnimComposer Editor.

The **AnimComposer** custom editor gives you direct access to all its **visual elements** and **style sheets**, making it easy to modify the interface.\
To begin editing, simply select the file **`AnimComposerEditor (Visual Tree Asset)`**.

If you’d like to learn more about how Unity’s **UI Toolkit** works — including how to style visual elements — check out Unity’s official [**UI Toolkit E-book**](https://unity.com/es/resources/scalable-performant-ui-uitoolkit-unity-6).

Prefer learning through video? There’s also a helpful video tutorial that explains [**UI Toolkit**](https://unity.com/es/resources/scalable-performant-ui-uitoolkit-unity-6) in the context of custom editors.

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Because this is a fairly deep topic, we won’t cover every detail of how the system works here.\
Instead, we’ll focus on a few simple visual modifications, all performed intuitively through the UI Builder Asset.

{% hint style="info" %}
You can also modify the **.UXML** files to adjust the **editor’s layout and structure**, or the **.USS** style sheets to change the **visual appearance and aesthetics**.
{% endhint %}

<figure><img src="/files/TfxHwDrvtmAoJ3Jz9JwP" alt=""><figcaption><p>Modifying the base button color by selecting and editing the <code>.CustomButton</code> style class.</p></figcaption></figure>

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<figure><img src="/files/KClrWNhEKAbxseOwkXrf" alt=""><figcaption><p>Changing the Animation Preview Window border color by selecting and editing the Visual Element.</p></figcaption></figure>

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<figure><img src="/files/M6xgbWvyGoki0t77NfBX" alt=""><figcaption><p>hanging the ActionBlocks border by editing the <code>.action-block</code> style class.</p></figcaption></figure>

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I’m showing only simple examples here, but the styling possibilities go far beyond color or border width. You can modify almost any aspect of the interface — even the layout and distribution of certain elements.

Keep in mind, however, that **`AnimationPreviewInspector.cs`** binds functionality to specific visual elements. For these to work correctly, their **assigned names must remain unchanged**.

You can also modify the **`AnimationPreviewInspector.cs`** script itself to extend functionality, though it’s strongly recommended to **back up the default version first**.

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