You can use the Style guide manager to create Style guides. These allow specific aspects of your Site Studio styles and templates to be managed from within the Drupal theme settings page (Appearance > Settings > "Theme"). You can think of Style guides as theme overrides.

The main uses for the Style guide manager are:

• Creating a website where the appearance needs to change depending on the active theme. This is useful when using context to switch a theme. For example, switching the theme if a user is logged in.
• Applying global styling and appearance changes to a website using a simple to use interface. This is useful if you want to allow non-technical users the ability to apply visual changes to the website's theme within a governed set of overrides you define.
• Creating design systems for multi-brand, multi-site solutions, where each brand needs to apply specific branding to a master design system.

The Style guide manager has two interfaces:

Style guide builder

This is an interface for defining theme-specific overrides. The output of the Style guide builder is a ‘Style guide’. For more information, see Creating style guides.

Style guides

This is an interface for applying values to your theme-specific overrides. For more information, see Using style guides.