---
pagination_next: null
description: Summary of the "Customizing a Blockly toolbox" codelab.
---

# Customizing a Blockly toolbox

## 8. Summary

The toolbox can be customized in a variety of ways to make it work for your application. In this codelab you learned:

- How to create a custom category.
- What method to override to change how the colour of the category is applied.
- What method to override to change the look of the category when selected.
- How to add an icon by adding a custom CSS class to the icon div.
- How to change what HTML Elements are used for different parts of a category.
- How to create a custom toolbox item.
  You can find the code for the [completed custom toolbox](https://github.com/RaspberryPiFoundation/blockly/docs/docs/codelabs/custom-toolbox/complete-code) on GitHub.
