* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

header {
  background-color: #333;
  color: #fff;
  padding: 1rem;
  text-align: center;
}
header h1 {
  float: left;
}

nav {
  background-color: #444;
  color: #fff;
  padding: 1rem;
  text-align: center;
}
nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 1rem;
}
nav a:hover {
  text-decoration: underline;
}

main {
  padding: 2rem;
}