title: How to override default Polymer CSS
body: <p>Right now <code>core-toolbar</code> has an <code>indent</code> class that indents the title to the right by <code>60px</code>, while material design dictates that the margin should actually be <code>80px</code> (as a matter of fact the number <code>60</code> never shows throughout the documentation).</p>
  
  <p>So I could easily go and edit it in <code>bower_components/core-toolbar/core-toolbar.css</code> but the problem is that, once I move the project somewhere else, I'd have to make the same edit once I've done my bower installs etc..</p>
  
  <p>Mind you that if I was to extend <code>core-toolbar</code> say, I'd have a problem with <code>core-header-panel</code> etc.. because it would be looking for either <code>&lt;core-toolbar&gt;</code> or something with the class <code>"core-header"</code> which is a bit of an annoyance, but it's something I can live with.</p>
  
  <p>What's the best way to do something like this?</p>