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HTML 

              
                <span class="cloud">
  <span class="particle p1"></span>
  <span class="particle p2"></span>
  <span class="particle p3"></span>
  
  <span class="raindrops">
    <span class="drop d0"></span>
    <span class="drop d1"></span>
    <span class="drop d2"></span>
    <span class="drop d3"></span>
    <span class="drop d4"></span>
    <span class="drop d5"></span>
    <span class="drop d6"></span>
    <span class="drop d7"></span>
    <span class="drop d8"></span>
    <span class="drop d9"></span>
    <span class="drop d10"></span>
    <span class="drop d11"></span>
    <span class="drop d12"></span>
    <span class="drop d13"></span>
    <span class="drop d14"></span>
    <span class="drop d15"></span>
  </span>
  
</span>
!

CSS 

              
                @import "bourbon";

$bg-color : #2F4E66;
$color : #DCE2EF;
$thunder : #a4cbd8;

body {
  background:$bg-color;
  @include animation(thunder 10s ease infinite);
}

$bh: 100px;
$bw: #{$bh*2.1};
$t : 2s;
$dn: 15;

.cloud {
  position:absolute;
  display:block;
  left:50%;
  top:50%;
  width:$bw;
  height:$bh;
  background:$color;
  border-radius:10% 15%;
  -webkit-filter: drop-shadow(8px 3px 0 rgba(0,0,0,0.2));
  @include animation(float #{$t/3} ease infinite);
  
  .particle {    
    position:absolute;
    display:block;
    bottom:0;
    background:$color;
    border-radius:47% 54%;
    
    &.p1 {
      width:$bh;
      height:$bh;
      left: #{-$bh/2};
      @include animation(rotate $t #{-$t/4} linear infinite);
    }
    
    &.p2 {
      width:#{$bh*1.4};
      height:#{$bh*1.4};
      left: 0;
      bottom:#{$bh/2};
      @include animation(rotate $t #{(-$t/4)*2} linear infinite);
      
    }
    
    &.p3 {
      width:#{$bh*2};
      height:#{$bh*2};
      right: #{-$bh};
      @include animation(rotate $t #{(-$t/4)*3} linear infinite);
    }
    
  }

  .raindrops {
    display:block;
    position:absolute;
    top:115%;
    width:100%;
    
    .drop {
      display:block;
      position:absolute;
      width:$bh/9;
      height:$bh/9;
      background:$color;
      border-radius: 50% 0 50% 50%;
      
      @for $i from 0 through $dn {
        
        &.d#{$i} {
          left:#{(100% / $dn) * $i}; 
          $t : 1.3s;
          @include animation(fall $t/3 #{(-$t/1.7)*$i} linear infinite);
        }
        
      }
      
    }
    
  }
  
}

@include keyframes (rotate) {
  0% {
    @include transform(rotateZ(0deg));
  }
  50% {
    @include transform(rotateZ(180deg) scale(0.95));    
  }
  100% {
    @include transform(rotateZ(360deg));
  }
}

@include keyframes (float) {
  0% {
    @include transform(translate3d(-50%, -50%, 0));
  }
  50% {
    @include transform(translate3d(-50%, -40%, 0) scale(0.95));   
  }
  100% {
    @include transform(translate3d(-50%, -50%, 0));
  }
}

@include keyframes (fall) {
  0% {
    opacity:0;
    @include transform(translate3d(500%, -500%, 0) scale(1) rotate3d(0,0,1,45deg));
  }
  45% {
    opacity:1;
    @include transform(translate3d(-100%, 0, 0) scale(1.1) rotate3d(0,0,0,45deg));   
  }
  100% {
    opacity:0;
    @include transform(translate3d(-500%, 500%, 0) scale(0.2) rotate3d(0,0,-1,45deg));
  }
}


@include keyframes (thunder) {
  0% {
    background:$bg-color;
  }
  9.99% {
    background:$bg-color; 
  }
  10% {
    background:mix($bg-color, $thunder); 
  }
  11% {
    background:$bg-color; 
  }
  49.99% {
    background:$bg-color; 
  }
  50% {
    background:mix($bg-color, $thunder); 
  }
  51.01% {
    background:$bg-color; 
  }
  54.99% {
    background:$bg-color; 
  }
  55% {
    background:mix($bg-color, $thunder); 
  }
  58% {
    background:$bg-color; 
  }
  64.99% {
    background:$bg-color; 
  }
  65% {
    background:mix($bg-color, $thunder); 
  }
  65% {
    background:$bg-color; 
  }
  68% {
    background:mix($bg-color, $thunder); 
  }
  70% {
    background:$bg-color; 
  }
  100% {
    background:$bg-color;
  }
  
}
!

JS
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999px

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