Set the size of the item. Line height is normally set to the same as the item height. This will center the text vertically. If image is used and a fixed width item is desired, set the width and height to match the size of the image. If dynamic item width is desired, uncheck the item width and use only padding and margin settings.
Set the space between the border and the text. This is normally used for dynamic item width. For example, to make the item expand and shrink with the width of the text, set values to the left and right padding.