You have complete control over the style sheet for your site, so you can change your site's style sheet to create a truly personalized look. Every theme we offer comes with one or more default style sheets. Typically, if the theme supports multiple style sheets, there will be a setting located on one of the menus in your dashboard, such as the Genesis->Theme Settings menu. Any custom styles you add load after the default styling and override those styles. This allows you to adjust the styling of a theme or plugin rather than building an entire style sheet from scratch. We have a great article on how to create custom CSS for your site, and we're here to support you to make whatever changes you need.