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HTML 

              
                <div id="christmas-decorations" class="christmas-decorations">
  <div class="tree">
    <div id="dropzone" class="tree-bottom"></div>
    <div id="dropzone-1"class="tree-middle"></div>
    <div id="dropzone-2" class="tree-top"></div>
  </div>
  <div id="decorations" class="decorations">
    <p class="text">Decorate the Christmas Tree:<p>
    <div id="ball1"></div>
    <div id="tree-star"></div>
    <div id="ball2"></div>
    <div id="ball3"></div>
    <div id="ball4"></div>
    <div id="ball5"></div>
    <div id="ball6"></div>
    <div id="bow"></div>
    <div id="bow2"></div>
    <div id="bow3"></div>
  </div>
  <div id="game-complete"><br/>Merry Christmas!!!</div>
</div>
!

CSS 

              
                body {
  display: flex;
  height: 100vh;
  justify-content: center;
  align-items: center;
  background-color: #5e6d5a;
}

.christmas-decorations {
  position: relative;
}

.christmas-decorations:before {
  content:"";
  position: absolute;
  border-radius:50%;
  background-color: rgba(0,0,0,0.5);
  width:200px;
  height:20px;
  top:180px;
  left:-80px;
}

.tree {
  position: relative;
  background-color: #57462a;
  width: 35px;
  height: 70px;
  top:120px;
}

.tree-bottom, .tree-middle {
  position: absolute;
  height:0;
  width:100px;
  border-right: 50px solid transparent;
  border-left: 50px solid transparent;
  border-bottom: 100px solid #64a85b;
}

.tree-bottom {
  top:-70px;
  left:-83px;
}

.tree-middle {
  top:-130px;
  left:-83px;
}

.tree-top {
  position: absolute;
  height:0;
  width:0;
  border-right: 70px solid transparent;
  border-left: 70px solid transparent;
  border-bottom: 120px solid #64a85b;
  top:-240px;
  left:-53px;
  z-index:1;
}

.tree-top:before {
  content:"";
  position: absolute;
  border-top: 10px solid rgba(0,0,0,0.5);
  border-right: 5px solid transparent;
  border-left: 105px solid transparent;
  top:120px;
  left:-50px;
  transform: skew(45deg);
}

.tree-top:after {
  content:"";
  position: absolute;
  border-top: 10px solid rgba(0,0,0,0.5);
  border-right: 5px solid transparent;
  border-left: 135px solid transparent;
  top:210px;
  left:-65px;
  transform: skew(45deg);
}

.decorations {
  position: absolute;
  width: 250px;
  height: 200px;
  background-color: white;
  left:-500px;
  top:-100px;
  box-shadow: 7px 7px rgba(0,0,0,0.5);
  z-index:3;
}

.text {
  text-align: center;
  font-weight: bold;
  font-family: tahoma;
  text-decoration: underline;
}

#ball1 {
  position: absolute;
  border-radius:50%;
  width:20px;
  height: 20px;
  background-color: #b65964;
  left:20px;
  cursor: pointer;
}

.tree-active {
  filter: brightness(110%);
}

#tree-star {
  position: absolute;
  display: block;
  width: 0px;
  height: 0px;
  border-right: 27px solid transparent;
  border-bottom: 20px solid #cec42f;
  border-left: 27px solid transparent;
  transform: rotate(-35deg);
  top:60px;
  left:50px;
  cursor: pointer;
    }

#tree-star:before {
      border-bottom: 20px solid #cec42f;
      border-left: 8px solid transparent;
      border-right: 8px solid transparent;
      position: absolute;
      height: 0;
      width: 0;
      top: -12.5px;
      left: -17.5px;
      display: block;
      content: '';
      transform: rotate(-35deg);
    }

#tree-star:after {
      position: absolute;
      display: block;
      top: 0.75px;
      left: -26.25px;
      width: 0px;
      height: 0px;
      border-right: 27px solid transparent;
      border-bottom: 20px solid #cec42f;
      border-left: 27px solid transparent;
      transform: rotate(-70deg);
      content:'';
}

#ball2 {
  position: absolute;
  border-radius:50%;
  width:22px;
  height: 22px;
  background-color: #7d45e6;
  left:120px;
  top:90px;
  cursor: pointer;
}

#ball3 {
  position: absolute;
  border-radius:50%;
  width:25px;
  height: 25px;
  background-color: #39bfd8;
  left:40px;
  top:120px;
  cursor: pointer;
}

#ball4 {
  position: absolute;
  border-radius:50%;
  width:23px;
  height: 23px;
  background-color: #cec431;
  left:80px;
  top:150px;
  cursor: pointer;
}

#ball5 {
  position: absolute;
  border-radius:50%;
  width:18px;
  height: 18px;
  background-color: #cec431;
  left:180px;
  top:150px;
  cursor: pointer;
}

#ball6 {
  position: absolute;
  border-radius:50%;
  width:25px;
  height: 25px;
  background-color: #b85863;
  left:180px;
  top:100px;
  cursor: pointer;
}

#bow {
  position: absolute;
  width: 1px;
  height: 0;
  border-bottom: 8px solid #7d45e6;
  border-top: 8px solid #7d45e6;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  transform: rotate(-90deg);
  left:170px;
  cursor: pointer;
}

#bow2 {
  position: absolute;
  width: 1px;
  height: 0;
  border-bottom: 7px solid #39bfd8;
  border-top: 7px solid #39bfd8;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  transform: rotate(-90deg);
  left:140px;
  top:160px;
  cursor: pointer;
}

#bow3 {
  position: absolute;
  width: 1px;
  height: 0;
  border-bottom: 7px solid #b85863;
  border-top: 7px solid #b85863;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  transform: rotate(-90deg);
  left:100px;
  top:130px;
  cursor: pointer;
}

#game-complete {
  display: none;
  position: absolute;
  font-size:60px;
  font-weight: bold;
  font-family: tahoma;
  color: #ae2012;
  text-shadow: 2px 2px #001219;
  top:-110px;
  left:-165px;
  z-index:4;
  text-align: center;
}
!

JS 

              
                var score = 0;

$( function() {
	$("#ball1, #tree-star, #ball2, #ball3, #ball4, #ball5, #ball6, #bow, #bow2, #bow3 ").draggable({ revert: "invalid" });
  $("#dropzone, #dropzone-1, #dropzone-2").droppable({
			accept: "#ball1, #tree-star, #ball2, #ball3, #ball4, #ball5, #ball6, #bow, #bow2, #bow3 ",
      classes: {
        "ui-droppable-active": "tree-active",},
      drop: function() {
	  score++  
	finish();
  },
    });

function finish() {
	if(score === 12)
	{
		$('#game-complete').delay(300).fadeIn("fast");
       }
     }
   });
!
999px

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