html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background-color: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.center-image {
  max-width: 90vw;
  max-height: 90vh;
  height: auto;
  width: auto;
}