The line-height property in CSS controls the space between lines of text. It is often set in a unitless value (e.g. line-height: 1.4;) so that it is proportional to the font-size. It’s a vital property for typographic control. Too low and lines are awkwardly squished together; too high and lines are awkwardly far apart. Both inhibit readability. But you probably already know that. In this article