body {
  font-family: Arial, sans-serif;
  background: black;
  color: white;
  text-align: center;
  margin: 0;
  padding: 0;
}
header {
  background: linear-gradient(to right, #000428, #004e92);
  padding: 40px;
}
h1 {
  font-size: 2.5em;
  margin: 0;
}
section {
  padding: 20px;
}
footer {
  background: #111;
  padding: 15px;
  font-size: 0.9em;
}