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HTML

              
                <div class="xmasTree"></div>

	<button class="SetUpTree">Click here to reveal Our Xmas Tree</button>

	<p class="merryXmasGreet">
		<span>May This Christmas Bring </span>
		<span>you Much Happiness </span>
		<span>For All Days Of The New Year</span>
		<span><a href="https://www.prashantsani.com/spider" target="_blank"></a>SPIDer Team</span>
	</p>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Lobster');
@import url('https://fonts.googleapis.com/css?family=Ubuntu');

*{ margin: 0; padding: 0; }
html, body{
	width: 100%;
	height: 100%;
	position: relative;
	overflow: hidden;
	font-family: 'Ubuntu', sans-serif;
	background: #ba0001; /* Old browsers */
	background: -moz-radial-gradient(center, ellipse cover,  #ba0001 0%, #630505 100%); /* FF3.6+ */
	background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,#ba0001), color-stop(100%,#630505)); /* Chrome,Safari4+ */
	background: -webkit-radial-gradient(center, ellipse cover,  #ba0001 0%,#630505 100%); /* Chrome10+,Safari5.1+ */
	background: -o-radial-gradient(center, ellipse cover,  #ba0001 0%,#630505 100%); /* Opera 12+ */
	background: -ms-radial-gradient(center, ellipse cover,  #ba0001 0%,#630505 100%); /* IE10+ */
	background: radial-gradient(ellipse at center,  #ba0001 0%,#630505 100%); /* W3C */
	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ba0001', endColorstr='#630505',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */

}
.xmasTree{
	width: 280px;
	height: 280px;
	margin: -250px auto 0 auto;
	position: relative;
	top: 50%;
}
.merryXmasGreet{
	opacity: 0;
	position: fixed;
	top: 50%;
	left: 50%;
	color: white;

			margin: 51px 0 0 -145px;
			font-size: 25px;
}
.merryXmasGreetVis{
	opacity: 1;
  	-webkit-transition: all 0.3s 4.5s cubic-bezier(.34,.87,.17,1.03);
	   -moz-transition: all 0.3s 4.5s cubic-bezier(.34,.87,.17,1.03);
		-ms-transition: all 0.3s 4.5s cubic-bezier(.34,.87,.17,1.03);
		 -o-transition: all 0.3s 4.5s cubic-bezier(.34,.87,.17,1.03);
			transition: all 0.3s 4.5s cubic-bezier(.34,.87,.17,1.03);
}
.merryXmasGreet span{
	display: block;
}
.merryXmasGreet span:nth-child(4){
	font-size: 30px;
	font-weight: bold;
}
.SetUpTree{
	position: fixed;
	left: 50%;
	top: 50%;
	margin: -35px 0 0 -190px;
	z-index: 5000;
	width: 380px;
	height: 70px;
	font-family: 'Lobster', cursive;
	color: #fff;
	font-size: 25px;
	border: 1px solid #4b0300;
	outline: none;
	cursor: pointer;
	background: #ab3123;
	background: -moz-linear-gradient(top,  #ab3123 0%, #5d0d0b 100%);
	background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ab3123), color-stop(100%,#5d0d0b));
	background: -webkit-linear-gradient(top,  #ab3123 0%,#5d0d0b 100%);
	background: -o-linear-gradient(top,  #ab3123 0%,#5d0d0b 100%);
	background: -ms-linear-gradient(top,  #ab3123 0%,#5d0d0b 100%);
	background: linear-gradient(to bottom,  #ab3123 0%,#5d0d0b 100%);
	-webkit-border-radius: 16px;
	   -moz-border-radius: 16px;
			border-radius: 16px;
	-webkit-box-shadow: 0 1px 3px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.25);
	   -moz-box-shadow: 0 1px 3px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.25);
			box-shadow: 0 1px 3px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.25);
}
.SetUpTree:hover, .SetUpTree:active{
	opacity: 0.8;
}
.xmasTreePart {
	position: absolute;
	z-index: 10;
	-webkit-transition: all 0.05s cubic-bezier(.34,.87,.17,1.03);
	   -moz-transition: all 0.05s cubic-bezier(.34,.87,.17,1.03);
		-ms-transition: all 0.05s cubic-bezier(.34,.87,.17,1.03);
		 -o-transition: all 0.05s cubic-bezier(.34,.87,.17,1.03);
			transition: all 0.05s cubic-bezier(.34,.87,.17,1.03);
}
.preClick .xmasTreePartEffect1{
	z-index: 10;
	-webkit-animation: xmasTreePartEffect1Anim 3.5s 0.5s infinite ease-in-out;
	   -moz-animation: xmasTreePartEffect1Anim 3.5s 0.5s infinite ease-in-out;
	   	-ms-animation: xmasTreePartEffect1Anim 3.5s 0.5s infinite ease-in-out;
	     -o-animation: xmasTreePartEffect1Anim 3.5s 0.5s infinite ease-in-out;
			animation: xmasTreePartEffect1Anim 3.5s 0.5s infinite ease-in-out;
}
@-webkit-keyframes xmasTreePartEffect1Anim{
	0%   { margin-top: 0; }
	50%  { margin-top: 15px; }
	100% { margin-top: 0; }
}
@-moz-keyframes xmasTreePartEffect1Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 15px; }
	100% { margin-top: 0; }
}
@-o-keyframes xmasTreePartEffect1Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 15px; }
	100% { margin-top: 0; }
}
@keyframes xmasTreePartEffect1Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 15px; }
	100% { margin-top: 0; }
}
.preClick .xmasTreePartEffect2{
	z-index: 20;
	-webkit-animation: xmasTreePartEffect2Anim 3.5s infinite ease-in-out;
	   -moz-animation: xmasTreePartEffect2Anim 3.5s infinite ease-in-out;
	   	-ms-animation: xmasTreePartEffect2Anim 3.5s infinite ease-in-out;
	     -o-animation: xmasTreePartEffect2Anim 3.5s infinite ease-in-out;
			animation: xmasTreePartEffect2Anim 3.5s infinite ease-in-out;
}
@-webkit-keyframes xmasTreePartEffect2Anim{
	0%   { margin-top: 0; }
	50%  { margin-top: 20px; }
	100% { margin-top: 0; }
}
@-moz-keyframes xmasTreePartEffect2Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 20px; }
	100% { margin-top: 0; }
}
@-o-keyframes xmasTreePartEffect2Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 20px; }
	100% { margin-top: 0; }
}
@keyframes xmasTreePartEffect2Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 20px; }
	100% { margin-top: 0; }
}
.preClick .xmasTreePartEffect3{
	z-index: 30;
	-webkit-animation: xmasTreePartEffect3Anim 3.5s infinite ease-in-out;
	   -moz-animation: xmasTreePartEffect3Anim 3.5s infinite ease-in-out;
	   	-ms-animation: xmasTreePartEffect3Anim 3.5s infinite ease-in-out;
	     -o-animation: xmasTreePartEffect3Anim 3.5s infinite ease-in-out;
			animation: xmasTreePartEffect3Anim 3.5s infinite ease-in-out;
}
@-webkit-keyframes xmasTreePartEffect3Anim{
	0%   { margin-top: 0; }
	50%  { margin-top: 20px; }
	100% { margin-top: 0; }
}
@-moz-keyframes xmasTreePartEffect3Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 25px; }
	100% { margin-top: 0; }
}
@-o-keyframes xmasTreePartEffect3Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 25px; }
	100% { margin-top: 0; }
}
@keyframes xmasTreePartEffect3Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 25px; }
	100% { margin-top: 0; }
}
.preClick .xmasTreePartEffect4{
	z-index: 40;
	-webkit-animation: xmasTreePartEffect4Anim 4.5s infinite ease-in-out;
	   -moz-animation: xmasTreePartEffect4Anim 4.5s infinite ease-in-out;
	   	-ms-animation: xmasTreePartEffect4Anim 4.5s infinite ease-in-out;
	     -o-animation: xmasTreePartEffect4Anim 4.5s infinite ease-in-out;
			animation: xmasTreePartEffect4Anim 4.5s infinite ease-in-out;
}
@-webkit-keyframes xmasTreePartEffect4Anim{
	0%   { margin-top: 0; }
	50%  { margin-top: 5px; }
	100% { margin-top: 0; }
}
@-moz-keyframes xmasTreePartEffect4Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 25px; }
	100% { margin-top: 0; }
}
@-o-keyframes xmasTreePartEffect4Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 25px; }
	100% { margin-top: 0; }
}
@keyframes xmasTreePartEffect4Anim {
	0%   { margin-top: 0; }
	50%  { margin-top: 25px; }
	100% { margin-top: 0; }
}
.xmasTreePartNo1{
	width: 26px;
	height: 28px;
	top: 30px;
	left: 100px;
	background: url(https://prashantsani.com/xmas2013/layers/01.svg) no-repeat;
}
.xmasTreePartNo2{
	width: 36px;
	height: 19px;
	top: 56px;
	left: 88px;
	background: url(https://prashantsani.com/xmas2013/layers/02.svg) no-repeat;
}
.xmasTreePartNo3{
	width: 44px;
	height: 34px;
	top: 243px;
	left: 196px;
	background: url(https://prashantsani.com/xmas2013/layers/03.svg) no-repeat;
}
.xmasTreePartNo4{
	width: 68px;
	height: 70px;
	top: 207px;
	left: 208px;
	background: url(https://prashantsani.com/xmas2013/layers/04.svg) no-repeat;
}
.xmasTreePartNo5{
	width: 91px;
	height: 25px;
	top: 253px;
	left: 106px;
	background: url(https://prashantsani.com/xmas2013/layers/05.svg) no-repeat;
}
.xmasTreePartNo6{
	width: 63px;
	height: 44px;
	top: 234px;
	left: 107px;
	background: url(https://prashantsani.com/xmas2013/layers/06.svg) no-repeat;
}
.xmasTreePartNo7{
	width: 51px;
	height: 59px;
	top: 220px;
	left: 146px;
	background: url(https://prashantsani.com/xmas2013/layers/07.svg) no-repeat;
}
.xmasTreePartNo8{
	width: 63px;
	height: 70px;
	top: 208.0px;
	left: 159px;
	background: url(https://prashantsani.com/xmas2013/layers/08.svg) no-repeat;
}
.xmasTreePartNo9{
	width: 63px;
	height: 43px;
	top: 177px;
	left: 160px;
	background: url(https://prashantsani.com/xmas2013/layers/09.svg) no-repeat;
}
.xmasTreePartNo10{
	width: 32px;
	height: 27px;
	top: 252px;
	left: 4px;
	background: url(https://prashantsani.com/xmas2013/layers/10.svg) no-repeat;
}
.xmasTreePartNo11{
	width: 26px;
	height: 59px;
	top: 221px;
	left: 23px;
	background: url(https://prashantsani.com/xmas2013/layers/11.svg) no-repeat;
}
.xmasTreePartNo12{
	width: 38px;
	height: 59px;
	top: 220px;
	left: 35px;
	background: url(https://prashantsani.com/xmas2013/layers/12.svg) no-repeat;
}
.xmasTreePartNo13{
	width: 60px;
	height: 101px;
	top: 178px;
	left: 48px;
	background: url(https://prashantsani.com/xmas2013/layers/13.svg) no-repeat;
}
.xmasTreePartNo14{
	width: 100px;
	height: 101px;
	top: 178px;
	left: 80px;
	background: url(https://prashantsani.com/xmas2013/layers/14.svg) no-repeat;
}
.xmasTreePartNo15{
	width: 22px;
	height: 22px;
	top: 178px;
	left: 176px;
	background: url(https://prashantsani.com/xmas2013/layers/15.svg) no-repeat;
}
.xmasTreePartNo16{
	width: 100px;
	height: 46px;
	top: 154px;
	left: 80px;
	background: url(https://prashantsani.com/xmas2013/layers/16.svg) no-repeat;
}
.xmasTreePartNo17{
	width: 63px;
	height: 52px;
	top: 126px;
	left: 81px;
	background: url(https://prashantsani.com/xmas2013/layers/17.svg) no-repeat;
}
.xmasTreePartNo18{
	width: 28px;
	height: 46px;
	top: 133px;
	left: 69px;
	background: url(https://prashantsani.com/xmas2013/layers/18.svg) no-repeat;
}
.xmasTreePartNo19{
	width: 53px;
	height: 20px;
	top: 121px;
	left: 68px;
	background: url(https://prashantsani.com/xmas2013/layers/19.svg) no-repeat;
}
.xmasTreePartNo20{
	width: 42px;
	height: 39px;
	top: 140px;
	left: 40px;
	background: url(https://prashantsani.com/xmas2013/layers/20.svg) no-repeat;
}
.xmasTreePartNo21{
	width: 37px;
	height: 39px;
	top: 89.3px;
	left: 84px;
	background: url(https://prashantsani.com/xmas2013/layers/21.svg) no-repeat;
}
.xmasTreePartNo22{
	width: 69px;
	height: 44px;
	top: 135px;
	left: 171px;
	background: url(https://prashantsani.com/xmas2013/layers/22.svg) no-repeat;
}
.xmasTreePartNo23{
	width: 69px;
	height: 55px;
	top: 124px;
	left: 171px;
	background: url(https://prashantsani.com/xmas2013/layers/23.svg) no-repeat;
}
.xmasTreePartNo24{
	width: 29px;
	height: 36px;
	top: 90px;
	left: 169px;
	background: url(https://prashantsani.com/xmas2013/layers/24.svg) no-repeat;
}
.xmasTreePartNo25{
	width: 60px;
	height: 84px;
	top: 116px;
	left: 120px;
	background: url(https://prashantsani.com/xmas2013/layers/25.svg) no-repeat;
}
.xmasTreePartNo26{
	width: 17px;
	height: 39px;
	top: 80px;
	left: 154px;
	background: url(https://prashantsani.com/xmas2013/layers/26.svg) no-repeat;
}
.xmasTreePartNo27{
	width: 50px;
	height: 49px;
	top: 79px;
	left: 120px;
	background: url(https://prashantsani.com/xmas2013/layers/27.svg) no-repeat;
}
.xmasTreePartNo28{
	width: 15px;
	height: 39px;
	top: 89px;
	left: 108px;
	background: url(https://prashantsani.com/xmas2013/layers/28.svg) no-repeat;
}
.xmasTreePartNo29{
	width: 50px;
	height: 16px;
	top: 74px;
	left: 75px;
	background: url(https://prashantsani.com/xmas2013/layers/29.svg) no-repeat;
}
.xmasTreePartNo30{
	width: 34px;
	height: 55px;
	top: 73.5px;
	left: 120px;
	background: url(https://prashantsani.com/xmas2013/layers/30.svg) no-repeat;
}
.xmasTreePartNo31{
	width: 35px;
	height: 34px;
	top: 57px;
	left: 171px;
	background: url(https://prashantsani.com/xmas2013/layers/31.svg) no-repeat;
}
.xmasTreePartNo32{
	width: 26px;
	height: 34px;
	top: 58px;
	left: 154px;
	background: url(https://prashantsani.com/xmas2013/layers/32.svg) no-repeat;
}
.xmasTreePartNo33{
	width: 32px;
	height: 31px;
	top: 50px;
	left: 123px;
	background: url(https://prashantsani.com/xmas2013/layers/33.svg) no-repeat;
}
.xmasTreePartNo34{
	width: 26px;
	height: 25px;
	top: 50px;
	left: 101px;
	background: url(https://prashantsani.com/xmas2013/layers/34.svg) no-repeat;
}
.xmasTreePartNo35{
	width: 26px;
	height: 33px;
	top: 49px;
	left: 153px;
	background: url(https://prashantsani.com/xmas2013/layers/35.svg) no-repeat;
}
.xmasTreePartNo36{
	width: 26px;
	height: 27px;
	top: 33px;
	left: 153px;
	background: url(https://prashantsani.com/xmas2013/layers/36.svg) no-repeat;
}
.xmasTreePartNo37{
	width: 28px;
	height: 11px;
	top: 40px;
	left: 126px;
	background: url(https://prashantsani.com/xmas2013/layers/37.svg) no-repeat;
}
.xmasTreePartNo38{
	width: 13px;
	height: 21px;
	top: 31px;
	left: 121px;
	background: url(https://prashantsani.com/xmas2013/layers/38.svg) no-repeat;
}
.xmasTreePartNo39{
	width: 26px;
	height: 18px;
	top: 31px;
	left: 134px;
	background: url(https://prashantsani.com/xmas2013/layers/39.svg) no-repeat;
}
.xmasTreePartNo40{
	width: 26px;
	height: 35px;
	top: 6px;
	left: 134px;
	background: url(https://prashantsani.com/xmas2013/layers/40.svg) no-repeat;
}
.xmasTreePartNo41{
	width: 202px;
	height: 131px;
	top: 49px;
	left: 41px;
	background: url(https://prashantsani.com/xmas2013/layers/41.svg) no-repeat;
	z-index: 1;
}
              
            
!

JS

              
                var $winHeight= $(window).innerHeight(),
		$winWidth= $(window).innerWidth();

		for(i=1;i<=41;i++){
			divToAdd=document.createElement('div');
			divToAdd.setAttribute('class','xmasTreePart xmasTreePartNo'+i)
			$('.xmasTree').append(divToAdd)
		}

		$(".xmasTreePart").each(function(index){
			if(index%2==0){
				randomTop = Math.floor( (Math.random()*($winHeight/4)) -(Math.random()*($winHeight/4))+40 ); 
				randomLeft = Math.floor( (Math.random()*($winWidth/2)) -(Math.random()*($winWidth/2))+20 ); 
				
			}
			else{
				randomTop = Math.floor( (Math.random()*($winHeight)) +(Math.random()*($winHeight/2))-40 ); 
				randomLeft = Math.floor( (Math.random()*($winWidth/2)) +(Math.random()*($winWidth/2))-20 ); 
				
			}
			$(this).css('left',randomLeft);
			$(this).css('top',randomTop);
			randomClass= "xmasTreePartEffect"+ Math.floor((Math.random()*4)+1); 
			$(this).addClass(randomClass);
		});

		$('.SetUpTree').click(function(){
			var addIndex=0,
			oneByOne;

			function addOneByOne() {
				if(addIndex<42){
					$(".xmasTreePartNo"+addIndex).attr('style','').removeClass('xmasTreePartEffect1 xmasTreePartEffect2 xmasTreePartEffect3 xmasTreePartEffect4');
					addIndex++;
					console.log(".xmasTreePartNo"+addIndex)
				}
				else{
					clearInterval(oneByOne);
					$("html").removeClass('preClick');
				}
			}

			oneByOne= setInterval(addOneByOne,100);

			$(this).fadeOut(function(){
				$(".merryXmasGreet").addClass('merryXmasGreetVis')
			});
			
		})
              
            
!
999px

Console