body,
html {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: black;
  color: white;
  font-size: 48px;
  cursor: pointer;
  user-select: none;
}

#player {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 200%; /* make it extra wide */
  height: 200%; /* make it extra tall */
  transform: translate(-50%, -50%);
  z-index: 1000;
  display: none;
  pointer-events: none; /* so clicks pass through if needed */
}