body {
  background-color: lightgray;
  color: black;
  font-family: Arial, sans-serif;
  margin: 10px;
}

h1 {
  text-align: center;
}

nav {
  text-align: center;
}

footer {
  text-align: center;
}
figure {
  text-align: center;
  margin-top: 20px;
}
figure img {
  display: block;
  margin: 0 auto;
}