CSS Units

November 12, 2010 by: aBisona

Measurement Values

Unit Description

%
percentage

in
inch

cm
centimeter

mm
millimeter

em
1em is equal to the current font size. 2em means 2 times the size of the current font. E.g., if an element is displayed with a font of 12 pt, then ’2em’ is 24 pt. The ‘em’ is a very useful unit in CSS, since it can adapt automatically to the font that the reader uses

ex
one ex is the x-height of a font (x-height is usually about half the font-size)

pt
point (1 pt is the same as 1/72 inch)

pc
pica (1 pc is the same as 12 points)

px
pixels (a dot on the computer screen)

Color Values

Value Description

color_name
A color name (e.g. red)

rgb(x,x,x)
An RGB value (e.g. rgb(255,0,0))

rgb(x%, x%, x%)
An RGB percentage value (e.g. rgb(100%,0%,0%))

#rrggbb
A HEX number (e.g. #ff0000)

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