Pick the class selector to apply the rule to all elements with their class attribute set to "tealElement".

<html>
<head>
    <style>
.tealElement {
background-color: teal;}
</style>
</head>
<body>
  <h2 class="tealElement">Fine Italian Suits</h1>
  <h2 class="tealElement">Artsy French Berets</h1>
</body>
</html>]]>

Make sure to pick .teal-element.