title: Set the page width to max 970px within Bootstrap 3
body: <p>I am using Bootstrap 3 to build a website that displays nicely on mobile devices and desktops. The customer tells me that the max width of a page can only be 970px.</p>
  
  <p>How can I do this with Bootstrap 3 to make sure that:</p>
  
  <ol>
  <li><p>The page still centered in a browser screen?</p></li>
  <li><p>All the great things in Bootstrap 3 are still there.</p></li>
  </ol>