body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}
header {
  background: #005f73;
  color: white;
  padding: 1rem;
  text-align: center;
}
nav a {
  color: white;
  margin: 0 1rem;
  text-decoration: none;
}
main {
  padding: 2rem;
  background: white;
}
footer {
  text-align: center;
  padding: 1rem;
  background: #003845;
  color: white;
  position: relative;
  bottom: 0;
  width: 100%;
}