body, html {
  margin: 0;
  padding: 0;
  height: calc(100dvh - 40px);
  padding-top: 20px;
  background: #000;
  color: white;
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
}

img {
  max-width: 90vw;
  max-height: calc(90vh - 40px);;
  width: auto;
  height: auto;
  display: block;
  object-fit: contain;

@media (max-width: 600px) {
  body, html {
    height: 100dvh;
    padding: 0;
  }
}