title: Change the shape of buttons ("arrow-ed" back button) in twitter bootstrap?
body: <p>I would like to know if there is any way to change the shape of a bootstrap button, to get something like this:</p>
  
  <p><img src="https://i.stack.imgur.com/OM1EI.png" alt="back button gmail"></p>
  
  <p>Any tips?</p>