body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f9f9f9;
}
header, footer {
  background-color: #111;
  color: white;
  padding: 1em;
  text-align: center;
}
.logo {
  height: 60px;
  display: block;
  margin: 0 auto 10px auto;
}
nav a {
  color: white;
  margin: 0 1em;
  text-decoration: none;
}
main {
  padding: 2em;
}