body {
  background-color: #fafafa;
  font-family: sans-serif;
}

header h1,
header nav,
footer {
  text-align: center;
}

nav,main {
  width: 600px;
  margin: 0 auto;
}

ul {
  list-style-type: none;
}
ul li {
  display: inline-block;
}
nav ul li a {
  color: blue;
  font-size: 18px;
  /* text-decoration: none; */
}