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description: Overview of the "Customizing your themes" codelab.
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# Customizing your themes

## 1. Codelab overview

### What you'll learn

In this codelab you will learn how to:

- Add component styles.
- Add a category style.
- Add a block style.

### What you'll build

A very simple Blockly workspace with customized themes.

### What you'll need

- A browser
- Basic knowledge of HTML, CSS, and JavaScript.

This codelab is focused on Blockly's theme extension. Non-relevant concepts
are glossed over and provided for you to simple copy and paste.
