What’s the best value to use with Line heights?

We recommend using decimals e.g. 1.3 as this makes the line height relate to your font size.

There are many options for setting line heights including keywords like normal, fixed lengths like 20px or percentages like 120% but we recommend using decimal based values like 1.2 as this will ensure the line height relates to the font size. If you increase or decrease the font size, the line height will stay in relative proportion.