/* Replace 'your-image-url' with the URL of your repeating alien image */
body {
  background-image: url('https://media.istockphoto.com/id/664373658/photo/alien.jpg?s=1024x1024&w=is&k=20&c=CcpGxAVUQI6l58Lp-HqLkcTJmnbItT5_uoLV9ptyGl4=');
  background-repeat: repeat;
  font-family: 'Comic Sans MS', sans-serif;
  color: #00FF00;
}

h1 {
  font-size: 2.5em;
  text-align: center;
}

h2 {
  font-size: 1.5em;
  text-align: center;
}

nav {
  text-align: center;
  margin-bottom: 1em;
}

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

nav li {
  display: inline;
  margin: 0 1em;
}