anchor.diff:  
   .action:hover {
   	color: #FFF;
  -	background: #666;
  +	background: #555;
   }
   
   header .action {
  
positive.code: 	display: inline-block;
  	width: 350px;
  	height: 350px;
  	padding: 0 1em 1.5em;
  	box-sizing: border-box;
  	transition: width 0.25s ease-in-out, height 0.25s ease-in-out, padding 0.25s ease-in-out;
  
negative.code: .action {
  	float: right;
  	color: #DDD;
  	background: #444;
  	border: none;
  	margin-left: 0.2em;
  	margin-bottom: 0.2em;
  