body, html {
  margin:0;
  height:100%;
  background: #ffffff;
  /* background-image: url("img/light-background.png");
  background-size: 100% 100%; */
}

#center {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  /* -ms-transform: translate(-50%, -50%); */
  transform: translate(-50%, -50%);
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
  pointer-events: none
}

#message {
  margin: 0;
  position: absolute;
  top: 70%;
  left: 50%;
  /* -ms-transform: translate(-50%, -50%); */
  transform: translate(-50%, -50%);
  font-size: xx-large;
  text-align: center;
  line-height: 1.5;
  color: #000000;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
  pointer-events: none
}

@media (prefers-color-scheme: dark) {
  body {
    margin:0;
    height:100%;
    background: #272727;
    /* background-image: url("img/dark-background.png");
    background-size: 100% 100%; */
  }
  #message {
    color: #ffffff;
  }
}