#line-height
Defines the height of a single line of text.
默认属性
line-height: normal;
Reverts to the default value of the browser.
recommended
line-height: 1.6;
You can use unitless values: the line height will be relative to the font size.
line-height: 30px;
You can use pixel values.
line-height: 0.8em;
You can use em values: like with unitless values, the line height will be relative to the font size.