In the CSS Rule Definition dialog box, select Box, and then set the style attributes you want.
Leave any of the following attributes empty if they are not important to the style:
Width and Height sets the width and height of the element.
Float sets which side other elements, such as text, layers, tables and so on, will float around an element. Other elements wrap around the floating element as usual. The Float attribute is supported by both browsers.
Clear defines the sides that do not allow layers. If a layer appears on the clear side, the element with the clear setting moves below it. The Clear attribute is supported by both browsers.
Padding specifies the amount of space between the content of an element and its border (or margin if there is no border). Deselect the Same For All option to set the padding for individual sides of the element.
Same For All sets the same padding attributes to the Top, Right, Bottom, and Left of the element to which it is applied.
Margin specifies the amount of space between the border of an element (or the padding if there is no border) and another element. Dreamweaver displays this attribute in the Document window only when it is applied to block-level elements (paragraphs, headings, lists, and so on). Deselect Same For All to set the margin for individual sides of the element.
Same For All sets the same margin attributes to the Top, Right, Bottom, and Left of the element to which it is applied.