title: How to add a ring around bootstrap glyphicons
body: <p>How do you add a ring around bootstrap glyphs, without using a solid circle? I have seen an example where you just sit a glyph over the top of the circle glyph, but then you don't get the correct background colour, as shown below.</p>
  
  <p><a href="https://i.stack.imgur.com/HuSu2.png" rel="noreferrer"><img src="https://i.stack.imgur.com/HuSu2.png" alt="Example"></a></p>