anchor.diff:      z-index: 10;
       background: #fff;
   }
  -body.side-compact main footer
  +.side-compact main footer
   {
       margin-left: 80px;
   }
   
   
  -body main footer .tools
  +main footer .tools
   {
       height: 40px;
       background: #e6e6e6;
  
positive.code:     width: 40px;
  }
  
  body.side-compact > main
  {
      padding-left: 80px;
  }
  
negative.code:     z-index: 1;
  }
  
  main footer
  {
      position: fixed;
      bottom: 0;
  