title: why jquery's ui.css files's font-sizes are bigger than normal?
body: <p>Im looking at jqueries tabs, datepicker etc and see that font-sizes of the classes added to elements are like 1.1em, 1em which seems big in the page. Why did they do this like that? 
  What is the purpose?
  <a href="http://jquery-ui.googlecode.com/svn/tags/latest/themes/base/jquery.ui.theme.css" rel="noreferrer">http://jquery-ui.googlecode.com/svn/tags/latest/themes/base/jquery.ui.theme.css</a></p>