html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;

  background: #ffffff;
  color: #000000;
  font-family: Arial, sans-serif;
}

.center {
  position: absolute;
  top: 46%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

#message {
  margin-bottom: 12px;
}

.footer {
  position: absolute;
  bottom: calc(12px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);

  font-size: 10px;
  white-space: nowrap;
}