*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 100%;
  height: 100%;
}
body {
  background-image: url('/dither.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  position: relative;
}
img {
  position: absolute;
  top: 5%;
  left: 2%;
  width: 120px;
}