Use the Type category in the CSS Rule Definition dialog box to define basic font and type settings for a CSS style.
1. Open the CSS Styles panel (Shift + F11) if it isn’t already open.
2. Double-click an existing rule or property in the top pane of the CSS Styles panel.
3. In the CSS Rule Definition dialog box, select Type, and then set the style properties.
Leave any of the following properties empty if they are not important to the style:
Font-size
Defines the size of the text. You can choose a specific size by selecting the number and the unit of measurement, or you can choose a relative size. Pixels work well to prevent browsers from distorting your text. The size attribute is supported by both browsers.