* {
  box-sizing: border-box;
  font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, "Helvetica Neue",  Arial, sans-serif;
  margin: auto;
}
body {
  background-color: #000;
}
body img {
  width: 100%;
}
.center {
  position: fixed;
  top: 0%;
  left: 50%;
  /* bring your own prefixes */
  transform: translate(-50%, -20%);
}