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CSS

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HTML 

              
                <div class="container">
  <div id="cloud">
    <span class="shadow"></span>
    <div class="rain">
      <div class="drop d1"></div>
      <div class="drop d2"></div>
      <div class="drop d3"></div>
      <div class="drop d4"></div>
      <div class="drop d5"></div>
      <div class="drop d6"></div>
      <div class="drop d7"></div>
      <div class="drop d8"></div>
      <div class="drop d9"></div>
      <div class="drop d10"></div>
      <div class="drop d11"></div>
      <div class="drop d12"></div>
      <div class="drop d13"></div>
      <div class="drop d14"></div>
      <div class="drop d15"></div>
    </div>
  </div>
</div>
!

CSS 

              
                body {
	background: #00416a;
}

.container{
  width: 500px;
  height: 500px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -250px;
  margin-left: -250px;
}

#cloud {
	width: 175px;
	height: 60px;
	background: #f2f9fe;
	background: -moz-linear-gradient(top,  #f2f9fe 5%, #d6f0fd 100%);
	background: -webkit-gradient(linear, left top, left bottom, color-stop(5%,#f2f9fe), color-stop(100%,#d6f0fd));
	background: -webkit-linear-gradient(top,  #f2f9fe 5%,#d6f0fd 100%);
	background: -o-linear-gradient(top,  #f2f9fe 5%,#d6f0fd 100%);
	background: -ms-linear-gradient(top,  #f2f9fe 5%,#d6f0fd 100%);
	background: linear-gradient(top,  #f2f9fe 5%,#d6f0fd 100%);
	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f2f9fe', endColorstr='#d6f0fd',GradientType=0 );
	position: relative;
	margin: 120px auto 20px;
	-webkit-border-radius: 50px;
	-moz-border-radius: 50px;
	border-radius: 50px;
  -webkit-animation: mover 3.5s infinite  alternate;
  animation: mover 3.5s infinite  alternate;
}

#cloud:after, div#cloud:before {
	content: '';
	position: absolute;
	z-indeX: -1;
	background: #f2f9fe;
}

#cloud:after {
	width: 50px;
	height: 50px;
	-webkit-border-radius: 50px;
	-moz-border-radius: 50px;
	border-radius: 50px;
	top: -25px;
	left: 25px;
}

#cloud:before {
	width: 90px;
	height: 90px;
	-webkit-border-radius: 100px;
	-moz-border-radius: 100px;
	border-radius: 100px;
	top: -45px;
	right: 25px;
}

.shadow {
	width: 175px;
	position: absolute;
	bottom: -80px;
	background: black;
	z-index: -1;
	-webkit-border-radius: 50%;
	-moz-border-radius: 50%;
	border-radius: 50%;
	-webkit-box-shadow: 0px 0px 25px 8px rgba(0,0,0,0.4);
	-moz-box-shadow: 0px 0px 25px 8px rgba(0,0,0,0.4);
	box-shadow: 0px 0px 25px 8px rgba(0,0,0,0.4);
}

.rain {
  position : absolute;
  height : 80%;
  width : 100%;
  color: #002266;
}

.drop {
  position : absolute;
  background : linear-gradient(#000000, #ffffff);
  opacity : 2;
  top : 25px;
}

.d1 {
  left : 97%;
  width : 1%;
  height : 5%;
  animation : fall .94s linear 0.69s infinite;
}

.d2 {
  left : 18%;
  width : 1%;
  height : 5%;
  animation : fall .98s linear 0.57s infinite;
}
.d3 {
  left : 38%;
  width : 1%;
  height : 5%;
  animation : fall .66s linear .60s infinite;
}

.d4 {
  left : 64%;
  width : 1%;
  height : 5%;
  animation : fall .69s linear .76s infinite;
}

.d5 {
  left : 95%;
  width : 1%;
  height : 5%;
  animation : fall .75s linear .56s infinite;
}

.d6 {
  left : 65%;
  width : 1%;
  height : 5%;
  animation : fall .75s linear .92s infinite;
}

.d7 {
  left : 19%;
  width : 1%;
  height : 5%;
  animation : fall .92s linear .72s infinite;
}

.d8 {
  left : 55%;
  width : 1%;
  height : 5%;
  animation : fall .84s linear .99s infinite;
}

.d9 {
  left : 35%;
  width : 1%;
  height : 5%;
  animation : fall .79s linear .53s infinite;
}

.d10 {
  left : 83%;
  width : 1%;
  height : 5%;
  animation : fall .82s linear .97s infinite;
}

.d11 {
  left : 8%;
  width : 1%;
  height : 5%;
  animation : fall .75s linear .56s infinite;
}

.d12 {
  left : 1%;
  width : 1%;
  height : 5%;
  animation : fall .60s linear .59s infinite;
}

.d13 {
  left : 13%;
  width : 1%;
  height : 5%;
  animation : fall .5s linear .5s infinite;
}

.d14 {
  left : 13%;
  width : 1%;
  height : 5%;
  animation : fall .80s linear .63s infinite;
}

.d15 {
  left : 13%;
  width : 1%;
  height : 5%;
  animation : fall .68s linear .75s infinite;
}

@-webkit-keyframes fall {
	to {margin-top:150px; opacity:0;}
}
@keyframes fall {
	to {margin-top:150px; opacity:0;}
}

@-webkit-keyframes mover {
    0% { transform: translateY(1rem); }
    100% { transform: translateY(2.6rem); }
}
!

JS
!
999px

Console