Open your site in Dreamweaver and do the following:
- Open any page of your site and select window > CSS Styles and Click the New CSS Style button (+ icon), a pop-up window will show up.
- Select Class in the Selector Type. Now type your style name in the Name box (example: .bullet). Use the Tag Selector Type for redefining HTML tags or the Advanced Selector Type for hovers, id attributes or combination of tags.
- Define the style in a New Style Sheet, give a name (example: styles.css) and save it under your site root. Click OK.
- In the CSS Style Definition pop-up window that appears give the Formatting Attributes like Font, List, Background, Border, Positioning, etc.
Pretty simple, don't you think?