title: What is the difference between Bootstrap .container and .container-fluid classes?
body: <p>Just downloaded 3.1 and found in the docs...</p>
  
  <blockquote>
    <p>Turn any fixed-width grid layout into a full-width layout by changing your outermost <code>.container</code> to <code>.container-fluid</code>.</p>
  </blockquote>
  
  <p>Looking in <code>bootstrap.css</code>, it appears that <code>.container-fluid</code> is identical to <code>.container</code>.  Both have the same CSS, and every instance of <code>.container-fluid</code> is paired with <code>.container</code>, and all column classes are specified in percentages.</p>
  
  <p>When twiddling with examples I could not see any difference, as everything seemed fluid.</p>
  
  <p>As I'm new to Bootstrap, I assume I'm missing something. Could someone take a minute and enlighten me?</p>