body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f4f4f9;
  color: #333;
}

header {
  background: #005f73;
  color: white;
  padding: 20px;
  text-align: center;
}

h1 {
  margin: 0;
}

main {
  padding: 20px;
}

.materials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 15px;
  margin-top: 20px;
}

.material-card {
  background: white;
  border: 2px solid #ccc;
  border-radius: 8px;
  padding: 15px;
  box-shadow: 2px 2px 6px rgba(0,0,0,0.1);
}

.material-card h3 {
  margin-top: 0;
  color: #005f73;
}

footer {
  text-align: center;
  padding: 10px;
  background: #ccc;
  margin-top: 20px;
}