margin

This property applies to all elements and define the margin separating them from page borders or other neighbor elements. It accepts from 1 to 4 values, separated by spaces.

These values should be in the following order : top, right, bottom and left.

Example :

margin:15; /* 15 pixel margin on all sides */
margin:1em 2em; /* 1em vertical margin, 2em horizontal margin */
margin:1em 1em 1em 2em; /* all margins of 1em, except left (2em) */

Top, right, bottom and left margins can be separately specified with below properties (they accept 1 value) :

 margin-top
 margin-right
 margin-bottom
 margin-left