title: Bootstrap 3 glyphicon white background
body: <p>What is the incantation to make a glyphicon have a white background instead of the normal, in bootstrap 3, gray one?  Surely they have built this in and I just haven't found it yet.   In general I am experiencing a lot of pain switching an existing angularjs project to bootstrap 3. Many seemingly arbitrary differences.  </p>
  
  <p>Note this is for making the background "white" not the icon itself.  A related question is whether there is a built in way to get a transparent background for a glyphicon.  </p>