Many times we would need to set margin for our objects. This will set the bottom margin of the object. It takes the following values. a) pt : You can set values in points. (e.g: 10pt or 100pt). b) px : You can set values in pixels. (e.g: 10px or 100px). c) % : You can set values in percentage. (e.g: 10% or 100%). d) auto : This will set a automatic / default margin.