Margins: Defines the amount of space between the multimedia file and the surrounding text (in pixels).
All sides: Allows you to set the margin around all sides of the file at once.
Left: Allows you to set the left margin.
Right: Allows you to set the right margin.
Top: Allows you to set the top margin.
Bottom: Allows you to set the bottom margin.
Preview: Displays how the control will look using the margins you set.