anchor.diff:  .overview {
     background: url(<%= image_url("coffeecups.jpg") %>) no-repeat center/cover;
  +  background-attachment: fixed;
     margin-top: $nav-margin * -1; // No space between the nav bar and the hero image.
     min-height: 200px;
   
  
positive.code:   }
  }
  
  
negative.code: /* Top section on the "how it works" page */
  .how-it-works {
    background: url(<%= image_url("meetup-background.jpg") %>) no-repeat center/cover;
    background-attachment: fixed;
  
    padding: 2rem 0;
    margin-top: $nav-margin * -1;
  
  