.scene {
  position:absolute;
  bottom:0;
  left:0;
  overflow:hidden;
  right:0;
  border-bottom:0;
  height:100%;
   z-index:0
}
.scene > div {
  position:absolute;
  bottom:0;
}
.ground {
  width:100%;
  height:30px;
  background:#1d1818;
  z-index:999;
}
.scene > div.clouds {
  width:895px;
  left:50%;
  margin-left:-447px;
     height: 331px;
    bottom: 0;
  background:url(../img/clouds.png?raw=true) no-repeat center;
}
.scene div.trees {
  width:908px;
  height:174px;
  background:url(../img/trees.png?raw=true) no-repeat center;
  z-index:100;
  left:50%;
  bottom:20px;
  margin-left:-454px;
}
.scene div.grass {
  width:964px;
  height:37px;
  z-index:200;
  left:50%;
  bottom:20px;
  margin-left:-482px;
  background:url(../img/grass.png?raw=true) no-repeat center;
}
.buildings {  
  width:763px;
  height:303px;  
  left:50%;
  margin-left:-400px;
  background:url(../img/buildings.png?raw=true) no-repeat center;
 }