; }
   .c { margin: 1em 0 0 0; background: aqua; }
   .b1 { margin: 1em 0 1em 0; }
   .b2 { margin: 0em 0 1em 0; }
   .b3 { margin: 1em 0 0em 0; }
   .b4 { margin: 0em 0 0em 0; }
   .b5 { margin: 0.5em 0 0.5em 0; }
   .b6 { margin: 0em 0 0.5em 0; }
   .b7 { margin: 0.5em 0 0em 0; }
   .control .a { margin: 0 0 1em 0; }
   .control .c { margin: 0; }
  </style>
 </head>
 <body>
  <p>Test passes if all 8 yellow and orange rectangles <strong>look the same</strong> (and all should look like the first rectangle).