Creating a custom theme
When creating a custom theme, there are three possibilities:
Use Classy as a base theme. This will result in some default classes and markup in your template files (since the template files from Classy will be used). You can however still override these template files in the custom theme.
Using Stable as a base theme. The minimum amount of default markup and classes will be added to the template files. This way, you have full control of all the markup and classes. This is the default option!
Not using a base theme, by setting
base theme: false.
In the following example, the relationship between two custom themes and Classy is demonstrated. The first theme, Awesome, uses Classy as a base theme. The second theme, Kitten, doesn't use Classy as a base theme.