anchor.diff:  /* Special Sections and Footer
   –––––––––––––––––––––––––––––––––––––––––––––––––– */
   
  +#logo {
  +  max-width: 400px;
  +}
  +
   summary {
     margin-top: 20px;
     border: 1px solid #ddd;
  
positive.code:   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 */
  
negative.code: }
  
  /* For devices larger than 550px */
  @media (min-width: 1000px) {
    .container {
      width: 80%; }
    .column,
  