body {
  margin: 0;
  font-family: Arial;
}
header {
  background: #111;
  color: white;
  padding: 15px;
  display: flex;
  justify-content: space-between;
}
nav a {
  color: white;
  margin: 10px;
  text-decoration: none;
}
.hero {
  background: #333;
  color: white;
  text-align: center;
  padding: 100px;
}
section {
  padding: 40px;
}
footer {
  background: #111;
  color: white;
  text-align: center;
  padding: 15px;
}