title: Reduce twitter bootstrap heading size by ratio
body: <p>Not sure if this is possible. I think the Twitter Bootstrap heading size is too big. <code>h1</code> is <code>36px</code>; <code>h2</code> is <code>30px</code>, and so on.</p>
  
  <p>Is there any way to reduce the heading size by ratio? Say I just want 90% of each heading instead. I don't wanna declare each heading's font size one by one.</p>
  
  <p>Thanks.</p>