body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background: white;
  color: blue;
  padding: 10px;
}
header h1 {
  display: inline-block;
  margin: 0;
}
nav ul {
  list-style: none;
  display: inline-block;
  margin: 0;
  padding: 0;
}
nav ul li {
  display: inline;
  margin: 0 10px;
}
nav ul li a {
  color: darkblue;
  text-decoration: none;
}
main {
  padding: 20px;
}
footer {
  background: #eee;
  text-align: center;
  padding: 10px;
}