In Dreamweaver CC and later, CSS Styles panel is replaced with CSS Designer. For more information, see CSS Designer.
Inspect mode works together with Live View to help you quickly identify HTML elements and their associated CSS styles. With Inspect mode turned on, you can hover over elements on your page to see the CSS box model attributes for any block-level element.
For more information on the CSS box model, see the CSS 2.1 specification.
In addition to seeing a visual representation of the box model in Inspect mode, you can also use the CSS Styles panel as you hover over elements in the Document window. When you have the CSS Styles panel open in Current mode and hover over an element on the page, the rules and properties in the CSS Styles panel automatically update to show you the rules and properties for that element. Additionally, any view or panel related to the element you’re hovering over updates as well (for example, Code view, the Tag selector, the Property inspector, and so on).