The margin-bottom property sets the bottom margin (space) of an element. The space is created outside the element's border.
Value
Description
(numeric)
e.g. '15' would set the bottom margin for an element to 15 pixels (Microthemer automatically adds the 'px' unit if a unit isn't specified). Other commonly used units include 'em' and '%'. So you could enter '5%' in the Bottom Margin field.
Margin Bottom
The margin-bottom property sets the bottom margin (space) of an element. The space is created outside the element's border.
Themeover CSS Reference
Online CSS References: Margin Bottom
Online CSS Tutorials: Padding & Margin