* {
  margin: auto;
}

body {
  background-image: url("https://www.allaboutlean.com/wp-content/uploads/2020/10/NASA-Galaxy.jpg");
  background-size: cover;
  padding: 20px;
  text-align:center
}

h1 {
  font-size: 50px;
  color: white;
}

button {
  background-color: green;
  padding: 10px;
}

button:hover {
  background-color: rgb(8, 53, 8);
}

#alien {
  display: none;
}