body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background: #fdfdfd; color: #222;
}
header {
  background: #0d253f; color: white;
  padding: 20px; text-align: center;
}
header h1 { margin: 0; }
nav a { color: #cde4ff; margin: 0 10px; text-decoration: none; }
nav a:hover { text-decoration: underline; }
main { padding: 20px; }
section { margin-bottom: 40px; }
h2 { color: #0d253f; }
footer {
  background: #0d253f; color: white;
  text-align: center; padding: 10px;
  position: relative; bottom: 0; width: 100%;
}
button { background: #0d253f; color: white; border: none; padding: 10px 15px; cursor: pointer; }
button:hover { background: #163b63; }