body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #222;
}
header, .hero, footer {
  text-align: center;
  padding: 40px 20px;
}
header {
  background: #001f3f;
  color: white;
}
.hero {
  background: white;
}
footer {
  background: #001f3f;
  color: white;
}