background-repeat: repeat;  /* default */
            background-size: 25% 25%;
            height: 200px;
            width: 200px;

            /*
            Background positioning area is 200px wide by 200px tall.
            So, the image should be rescaled to 50px by 50px
            and be repeated four times in horizontal and vertical.
            */
        }
    </style>
  </head>
  <body>
    <p>Test passes if there is 4 rows of 4 blue-and-orange squares and if there is <strong>no partially</stro