

1. Add a media query for 640px and below
2. Remove floats from columns and set width to 100%
3. Disable offsets
4. Add some padding to all rows, excepts for .plans.row
5. Hide the navigation
6. Add the following to the media query to enlarge and center text on mobile devices:
 
body {
    font-size: 24px;
  }
header p.tagline {
    text-align: center;
    font-size: 1em;
  }

7. Add 
    <meta name="viewport" content="width=device-width, initial-scale=1">

