           {
                border: solid green 1em;
                margin-top: 2em;
                width: 300px;
            }
        </style>
    </head>
    <body>
        <p>Test passes if the two boxes look the same.</p>
        <div id="test">Filler Text</div>
        <div id="reference">Filler Text</div>
    </body>
</html>