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              <div id="Clouds">
  <div class="Cloud Foreground"></div>
  <div class="Cloud Background"></div>
  <div class="Cloud Foreground"></div>
  <div class="Cloud Background"></div>
  <div class="Cloud Foreground"></div>
  <div class="Cloud Background"></div>
  <div class="Cloud Background"></div>
  <div class="Cloud Foreground"></div>
  <div class="Cloud Background"></div>
  <div class="Cloud Background"></div>
<!--  <svg viewBox="0 0 40 24" class="Cloud"><use xlink:href="#Cloud"></use></svg>-->
</div>

<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 width="40px" height="24px" viewBox="0 0 40 24" enable- xml:space="preserve">
  <defs>
    <path id="Cloud" d="M33.85,14.388c-0.176,0-0.343,0.034-0.513,0.054c0.184-0.587,0.279-1.208,0.279-1.853c0-3.463-2.809-6.271-6.272-6.271
	c-0.38,0-0.752,0.039-1.113,0.104C24.874,2.677,21.293,0,17.083,0c-5.379,0-9.739,4.361-9.739,9.738
	c0,0.418,0.035,0.826,0.084,1.229c-0.375-0.069-0.761-0.11-1.155-0.11C2.811,10.856,0,13.665,0,17.126
	c0,3.467,2.811,6.275,6.272,6.275c0.214,0,27.156,0.109,27.577,0.109c2.519,0,4.56-2.043,4.56-4.562
	C38.409,16.43,36.368,14.388,33.85,14.388z"/>
  </defs>
</svg>
            
          
!
            
              @import "lesshat";

#Clouds {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  margin: auto;
  height: 30%;
  overflow: hidden;
  animation: FadeIn 3s ease-out;
  user-select: none;
}

@keyframes FadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@duration: 120s;

.Cloud { 
  position: absolute;
  width: 100%;
  //outline: solid 1px #F00;
  background-repeat: no-repeat;
  background-size: auto 100%;
  height: 70px;
  animation-duration: @duration;
  animation-iteration-count: infinite;
  animation-fill-mode: forwards;
  animation-timing-function: linear;
  animation-name: Float, FadeFloat;
  z-index: 1;
}

@height: 10%;

.Cloud.Foreground { 
  height: @height;
  min-height: 20px;
  z-index: 3;
}
.Cloud.Background { 
  height: @height / 1.1; 
  min-height: 8px;
  animation-duration: @duration * 1.75;
  //animation-delay: -2s;
}

@keyframes Float {
  from { transform: translateX(100%) translateZ(0); }
  to { transform: translateX(-15%) translateZ(0); }
}

/*
@keyframes Float {
  from { transform: translateX(100%) translateY(-100%) translateZ(0); }
  50% { transform: translateX(55%) translateY(0) translateZ(0); }
  to { transform: translateX(-5%) translateY(-100%) translateZ(0); }
}
*/

@keyframes FadeFloat {
  0%, 100% { opacity: 0; }
  5%, 90% { opacity: 1; }
}

.Cloud-Loop (@delay, @i) when (@i > 0) { 
  .Cloud:nth-child(@{i}) { 
    animation-delay: (@delay * @i ); 
    top: unit( @i * 6 ,%);
  }
  .Cloud.Foreground:nth-child(@{i}) {
    animation-duration: (@duration - (@i * 4));
    height: (@height + (@i * 2.5));
  }
  .Cloud.Background:nth-child(@{i}) {
    animation-duration: (@duration * 1.25 - (@i * 4));
    //animation-duration: ((@duration * 1.75) - (@i * 2) );
    height: ((@height / 1.1) - (@i * 1.25));
  }
  
  .Cloud-Loop(@delay, (@i - 1)); // Keep Looping
}
.Cloud-Loop (0) {} // End loop
.Cloud-Loop ((@duration / 6.5 ) * -1, 10);


.Cloud { 
  background-image: url(data:image/png;base64,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);
}

.Cloud.Background {
  background-image: url(data:image/png;base64,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);
}


// Presentational
html, body { margin: 0; padding: 0; }
html { height: 100%; } body { min-height: 100%; }

body {
  color: #FFF;
  background-color: #FD940A;
  background-image: radial-gradient(circle, #F9A72B 0%, #FA9026 70%, #FB6C1F 100%);
}
            
          
!
999px
Loading ..................

Console