Step 1 Open .info file and declare the styles for Quicktabs with this rule:
quicktabs_styles[style_name] = Extend style for Quicktabs
Example Let's extend the style for Quicktabs in TB Simply theme. Just add this line:
quicktabs_styles[simply] = Simply Style for Quicktabs
Step 2 Add style sheet css/quicktabs/simply.css
Step 3 Styling for extend style with class name
quicktabs-style-simply: for quicktabs rendererquick-accordion-simply: for accordion rendererquicktabs-ui-simply: for ui_tabs renderer
Backend Take a look at the Quicktabs configuration in the back-end.