Headings
All HTML headings, <h1> through <h6> are available.
h1. Heading 1
h2. Heading 2
h3. Heading 3
h4. Heading 4
h5. Heading 5
h6. Heading 6
Body copy
Bootstrap's global default font-size is 14px, with a line-height of 20px. This is applied to the <body> and all paragraphs. In addition, <p> (paragraphs) receive a bottom margin of half their line-height (10px by default).
Lead body copy
Make a paragraph stand out by adding .lead. 例子：
Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Duis mollis, est non commodo luctus.
<p class="lead">...</p>
Built with Less
The typographic scale is based on two LESS variables in variables.less: @baseFontSize and @baseLineHeight. The first is the base font-size used throughout and the second is the base line-height. We use those variables and some simple math to create the margins, paddings, and line-heights of all our type and more. Customize them and Bootstrap adapts.