The font-size Property

Sets the font size, which can be specified either in absolute or relative units.

p { font-size: 12pt }

Property Value Unit Type Example
font-size: 12pt Absolute The quick brown fox jumps over the sleazy dog.
font-size: 12px Absolute The quick brown fox jumps over the sleazy dog.
font-size: medium Absolute The quick brown fox jumps over the sleazy dog.
font-size: smaller Relative The quick brown fox jumps over the sleazy dog.
font-size: normal Relative The quick brown fox jumps over the sleazy dog.
font-size: larger Relative The quick brown fox jumps over the sleazy dog.
font-size: 50% Relative The quick brown fox jumps over the sleazy dog.

Absolute size keywords: xx-small, x-small, small, medium, large, x-large, xx-large.