height: 6em; margin-top:0}
    .ref { background-color: #008000; width: 12em; height: 6em; margin-bottom: 0}
    .test { background-color: hsla(120 100% 25% / 1.0)}
</style>
<body>
    <p>Test passes if you see a green square, and no red.</p>
    <p class="ref"> </p>
    <p class="test"> </p>
</body>
