body {
  background-color: #40ff53;
  font-family: serif;
  background:url(wallpaper.jpg);
}
.door {
  background: url("door.png") no-repeat;
  width:24px;
  height:25px;
  margin:10px;
}
.door:hover {
  background: url("door2.png") no-repeat;
  width:24px;
  height:25px;
  margin:10px;
}
#main {
  background-color:#ffffff;
  border:2px solid;
  border-color:#000000;
  padding: 25px 50px;
  width:75%;
  margin-left:10%;
  margin-right:10%;
}
#next {
  background-color:#ffffff;
  border:2px dotted;
  border-color:#000000;
  padding:8px 10px;
  margin-left:10%;
  margin-right:10%;
}