When the "Include CSS" setting is set to false the CSS definitions that style your store will be removed. However, the class names themselves are still applied to the elements. Setting this to false will allow you to author your own CSS definitions without having to worry about overriding the default definitions.

Turn this setting off:

• You want more control over how your store looks
• You are comfortable writing CSS

Keep this setting turned on if:

• You are not familiar with CSS
• You like the way your store currently looks