body {
  font-family: Arial, sans-serif;
  margin: 0;
}

header {
  background-color: #333;
  color: #fff;
  padding: 10px;
  height: 46px;
}

header nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

header nav li {
  display: inline-block;
  margin-right: 20px;
}

header nav a {
  color: #fff;
  text-decoration: none;
}
main {
  margin: 20px;
}

footer {
  background-color: #333;
  color: #fff;
  padding: 10px;
  margin-top: 20px;
}