html, body {
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  justify-content: center; 
  align-items: center;  
}

img {
  max-width: 100%;
  max-height: 100%;
  height: auto;
}

img {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -moz-touch-callout: none;
  -moz-user-select: none;
  touch-callout: none;
  user-select: none;
  pointer-events: none;
}