html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background-image: url('https://c.tenor.com/ckucH0RogzMAAAAC/tenor.gif');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: black;
  font-family: Verdana;
}