The font-size property supports a variety of methods for specifying a font size. For example, there are seven different absolute size keywords, which set the font size relative to the user's font size preference.

You can also make fonts larger or smaller by way of the larger or smaller keywords.

You can make fonts 50% larger or 25% smaller by way of percentages.

You can even make a font 50% larger or 25% smaller by way of em units.