body {
  margin: 0;
  background-image: url("https://wonderworlds.org/snowflakes/snowflakes-fantasy-blue-light-bright-background-fill.jpg");
}

#door {
  width: auto;
  height: auto;
}

#doorimage {
  display: block;
  margin: 10% auto 0% auto;
  width: 20%;
  box-shadow: 0 0 5px 20px rgb(255, 255, 255);
}