anchor.diff:    h2 {
       font-weight: normal;
       text-align: center;
  +    font-size: 24px;
       margin: 20px auto 15px;
       color: white;
       @include shadow-black(0.20);
  
positive.code:   width: 20px;
    text-align: center;
    line-height: inherit;
  }
  
  ////////
  
negative.code:     line-height: auto;
      margin: 0;
    }
    h2 { font-size: 24px; }
    h3 { font-size: 18px; line-height: 30px; }
    h4 { font-size: 14px; small { font-size: 12px;} }
    [class^="icon-"], [class*=" icon-"] {
  