body {
  background-color: black;
}
body > div {
  position: absolute;
  border: none;
  background-color: black; 
}
div > a {
  position: absolute;
  text-align: center;
  font-weight: bold;
  color: black;
}
div > img {
  max-width: 100%;
  max-height: 100%;
}