css
body {
  background-color: #f2f2f2;
  font-family: "Arial", sans-serif;
  font-size: 18px;
  line-height: 1.5;
  color: #000;
}

.container {
  width: 800px;
  margin: 40px auto;
  padding: 20px;
  background-color: #fff;
  border: 4px solid #000;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.highlight {
  background-color: #ff0;
  padding: 4px 8px;
  border: 1px solid #000;
}

.subheading {
  font-size: 14px;
  font-weight: bold;
  color: #666;
  margin-bottom: 10px;
}

.content {
  font-size: 16px;
  line-height: 1.2;
  color: #333;
  padding: 10px 20px;
}

.link {
  text-decoration: none;
  color: #00f;
  border-bottom: 2px solid #000;
}

.link:hover {
  text-decoration: underline;
}

.discussion-groups {
  list-style: none;
  padding: 0;
  margin: 0;
}

.discussion-groups li {
  display: inline-block;
  margin: 10px 20px;
  padding: 10px 20px;
  border-bottom: 2px solid #000;
}

.discussion-groups a {
  color: #333;
  text-decoration: none;
  border-bottom: 2px solid #000;
}

.social-media {
  padding: 10px 20px;
  background-color: #f2f2f2;
  border-bottom: 4px solid #000;
}

.social-media a {
  margin-right: 20px;
  text-decoration: none;
  color: #333;
}