Topic Coloring

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Topic Coloring</title>
  <style>
    p {
      cursor: pointer;
    }
  </style>
</head>

<body>
  <div>
    <p data-topic-name="discussion" onclick="newMessage('discussion')">General discussion</p>
    <p data-topic-name="bugs" onclick="newMessage('bugs')">Bugs</p>
    <p data-topic-name="animals" onclick="newMessage('animals')">Animals</p>
  </div>
</body>

<script>
  function newMessage(topic) {
    const paragraph = document.querySelector(`p[data-topic-name="${topic}"]`);
    const pStyle = paragraph.getAttribute('style');
    const coloredTopicStyle = 'background: red; color: white;';
    const newStyle = pStyle === coloredTopicStyle ? '' : coloredTopicStyle;
    paragraph.setAttribute('style', newStyle);
  }

  newMessage('discussion');
</script>

</html>