The line-height property will accept a value to control the spacing between baselines of text. When the value is a number, the line height is calculated by multiplying the element's font size by the number.

Percentage values are relative to the element's font size.

normal | <number> | <length> | <percentage> | inherit

div { line-height: 1.2; font-size: 10pt }     /* number */

div { line-height: 1.2em; font-size: 10pt }   /* length */

div { line-height: 120%; font-size: 10pt }    /* percentage */