body {
  font-family: Arial, sans-serif;
  margin: 40px;
  line-height: 1.6;
}

header, footer {
  background: #f4f4f4;
  padding: 20px;
}

h1, h2 {
  color: #003366;
}

.warning {
  background: #fff3cd;
  padding: 10px;
  border-left: 5px solid #ffcc00;
}