html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}
body {
  font-family: sans-serif;
  font-size: 16px;
  background-color: rgb(31, 31, 31);
}
div#screen {
  width: 100%;
  height: 100%;
}
div#loading {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 1px 2px;
  color: rgb(31, 31, 31);
  background-color: rgb(223, 223, 223);
  border-radius: 2px;
  font-size: 12px;
}