body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 0;
}

header {
  background-color: #007bff;
  color: white;
  padding: 20px;
  text-align: center;
}

main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding: 20px;
  gap: 20px;
}

.course-card {
  background-color: white;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  padding: 20px;
  width: 280px;
  text-align: center;
}

.course-card h2 {
  font-size: 18px;
  margin-bottom: 10px;
}

.course-card button {
  background-color: #28a745;
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 5px;
  cursor: pointer;
}

.course-card button:hover {
  background-color: #218838;
}