PROPERTY: margin

margin : length | percentage | auto
Compatibility:  IE4+  N4+
Version: Level 1
Inherited: No
The margin property is a shortcut for setting the margin-bottom, margin-left, margin-right, and/or margin-top properties in one declaration.
You can declare one, two, three or four values:
If you declare one value, the size for all four margins will be that value.
If you declare two values, the top and bottom margins will be set by the first value, the right and left margins by the second.
If you declare three values, the top margin will be set by the first value, the right margin by the second, and the bottom and left margins by the third.
If you declare four values, the order is top, right, bottom, left.
The length value can be in any of the following seven units. Use the abbreviation.
Length Abbrev.
centimeters cm
ems em
inches in
millimeters mm
picas pc
pixels px
points pt

The percentage value is based upon the total width being defined as 100%.
The auto value directs the browser to automatically calculate all four margins. By declaring auto, you can ensure that any previous declaration will not effect the margins.
body { margin: 25mm; }
body { margin: 1.0in; }
body { margin: 15pc 25pc; }
body { margin: 36pt 24pt 36pt; }
body { margin: 11.5%; }
body { margin: 10% 10% 10% 10%; }
body { margin: auto; }

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