body {
  background: linear-gradient(to bottom, #0b1e3c, #1f3a5f);
  color: #ffffff;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
}
header, footer {
  background-color: #081c37;
  padding: 1rem 2rem;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 0;
}
nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}