Specifying Browser Defaults With the Style Composer

Reference:

Specifying Font Styles Using the Style Composer
Specifying Background Properties Using the Style Composer
Specifying Text Styles Using the Style Composer
Specifying Position Mode Using the Style Composer
Specifying Layout Styles Using the Style Composer
Specifying Edge Styles Using the Style Composer
Specifying List Styles Using the Style Composer
Specifying Interface Effects Using the Style Composer
Specifying Border Settings Using the Style Composer

You can use the Style Composer to control default settings for font, background properties, position mode, flow control, margins, list styles, and visual effects.