html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background: #000;
  overflow: hidden;
}

body {
  background-image: url("rose-bw.jpg");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: auto 55vmin;
  background-color: #000;
}