[hidden=true] {
  display: none;
}

body {
  display: block;
}

@media only screen and (orientation: landscape) {
  body {
    max-width: 800px;
  }
}

@media only screen and (orientation: portrait) {
  body {
    zoom: 200%;
  }
}

.footer {
  position: absolute;
  bottom: 0;
  right: 0;
  margin-right: 1ch;
}