[hidden] {
  display: none !important;
}
html,
body {
  margin: 0;
  padding: 0;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}
body.page-viewer {
  background: #000;
  overflow: hidden;
  /* Vertical drags still tune the sign. Horizontal edge swipes stay with the
     system, so the Android back gesture is not swallowed by the page. */
  touch-action: pan-x;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}
.viewer-stage {
  position: fixed;
  inset: 0;
  box-sizing: border-box;
  padding:
    env(safe-area-inset-top, 0px)
    env(safe-area-inset-right, 0px)
    env(safe-area-inset-bottom, 0px)
    env(safe-area-inset-left, 0px);
}