body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background-color: #40E0D0;
}

header {
  background: #0077cc;
  color: white;
  padding: 1.5rem;
  text-align: center;
}

main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding: 1rem;
}

.card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  margin: 1rem;
  padding: 1rem;
  width: 300px;
}

.card h2 {
  color: #0077cc;
}

.card a {
  color: #0077cc;
  text-decoration: none;
}

footer {
  background: #333;
  color: white;
  text-align: center;
  padding: 1rem;
}