/* Prevent scrolling, center content, pure white background */
html, body {
  height: 100%;
  margin: 0;
  background: #fff;
  overflow: hidden;         /* no scrollbars */
  touch-action: none;       /* minimize touch scrolling */
}
.wrapper {
  height: 100vh;
  width: 100vw;
  display: grid;
  place-items: center;
}
img.centered-fit {
  max-width: 100vw;
  max-height: 100vh;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  -webkit-user-drag: none;
  user-select: none;
}