anchor.diff:    h1 { font-size: 2.6rem; font-weight: 700; }
     h2 { font-size: 2.2rem; font-weight: 700; }
     h3 { font-size: 1.8rem; font-weight: 700; }
  -  nav {
  -    position: fixed;
  -    width: 180px;
  -  }
   }
   
   /* Larger than desktop */
  
positive.code: }
  
  /* For devices larger than 550px */
  @media (min-width: 550px) {
    .container {
      width: 80%; }
    .column,
  
negative.code: /* Special Sections and Footer
  –––––––––––––––––––––––––––––––––––––––––––––––––– */
  
  #logo {
    max-width: 400px;
  }
  
  summary {
    margin-top: 20px;
    border: 1px solid #ddd;
  