body {
  font-family: Arial, sans-serif;
  background: #111;
  color: #fff;
  margin: 0;
  padding: 0;
}

header {
  background: #1a1a1a;
  padding: 20px;
  text-align: center;
}

.highlight {
  color: #0f0;
}

#courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  padding: 20px;
}

.course {
  background: #222;
  padding: 10px;
  border-radius: 6px;
  transition: transform 0.3s;
}

.course:hover {
  transform: scale(1.05);
}