body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background-color: #333;
  color: white;
  padding: 10px 20px;
}
header h1 {
  margin: 0;
  display: inline-block;
}
nav {
  display: inline-block;
  margin-left: 20px;
}
nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding: 20px;
}
footer {
  background-color: #f2f2f2;
  padding: 10px 20px;
  text-align: center;
}