* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  min-height: 100vh;
  background-color: black;
  color: whitesmoke;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.3rem;
}

main {
  display: block;
  padding: 2rem;
}

h1 {
  text-align: center;
}

img {
  display:block;
  margin-left: auto;
  margin-right: auto;
}