# Theme Builder

Wisej.NET Theme Builder is a self-contained Windows executable that allows you to edit or create Wisej themes and theme mixins.

The theme system in Wisej.NET is quite powerful and goes beyond simple CSS, LESS or SASS. It is entirely contained in a single JSON file, including colors, images, fonts and appearances. You can virtually change any visual aspect of Wisej controls through a single theme file.

### Main Window <a href="#main-window" id="main-window"></a>

<figure><img src="https://215843345-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FyrHxzbanglDTTaYfB34Z%2Fuploads%2Fgit-blob-2999ff902f2b1e6cb4f50e198cbf276a3caf6e1d%2Fimage%20(40)%20(1).png?alt=media" alt=""><figcaption></figcaption></figure>

{% embed url="<https://docs.wisej.com/theme-builder/>" %}


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```
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```

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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.