title: Making a class invisible
body: <p>I'm want to have a div with class "a" to be invisible. I've tried already to give it the <code>display: none;</code> line in the CSS file but what it does is hide it, yet it doesn't catch any space and so all my other boxes don't stay in place.</p>
  
  <p>Is there a way to do this using CSS?</p>