main{
    border:2px solid black;
    width:80%;
    height:80%;
}

#sky{
    display:flex;
    background-color:#C9FFFF;
    padding:50px;
    padding-bottom:0;
    height:200px;
    overflow:hidden;
    justify-content:center;
}
.tree{
    width: 0;
	height: 0;
	border-left: 25px solid transparent;
	border-right: 25px solid transparent;
	border-bottom: 50px solid #01361D;
	margin-left:5%;
	display:inline;
	z-index:102;
}
#snow{
    height:50%;
    background-color:#fff;
    padding:50px;
    z-index:100;
}
#pond {
  height: 100px;
  width: 200px;
  background-color: #00EBE7;
  border-radius: 50%;
  margin:25%;
  z-index:101;
}
#sun{
    width:100px;
    height:100px;
    border-radius:50%;
    background-color:#FFFDC2;
    animation-name:sunAnimation;
    animation-duration:10s;
}

@keyframes sunAnimation{
    0%{margin:200px;}
    50%{margin:-100px;}
    100%{margin:0;}
}