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HTML 

              
                <h1>SVG with CSS animations </h1>
<div class="scene">
  <span class="cloud cloud--small"></span>
  <svg xmlns="http://www.w3.org/2000/svg" id="plane" class="plane" viewBox="0 0 104 47" x="0" y="0" width="104" height="47" background-color="#ffffff00">
    <g id="avion">
      <path d="M20 36C25 38 69 43 80 40 92 38 106 33 104 21 103 13 95 13 90 9 85 5 79 2 76 1 70-1 65 0 60 2 57 3 25 14 23 13 21 12 12 2 9 3 5 4 1 5 1 6 2 7 15 34 20 36Z" fill="#0085b2"/>
      <path d="M23 36C28 37 69 43 80 40 88 38 98 34 102 29 82 32 22 36 23 36Z" stroke="#ffffff00" stroke-width="1" fill="#14647f"/>
      <path d="M42 39C48 40 60 40 67 40 71 32 72 26 72 26L44 29C44 29 44 35 42 39Z" stroke="#ffffff00" stroke-width="1" fill="#0c3b4d"/>
      <path d="M7 16C7 16 9 20 10 22 13 27 16 13 16 13L7 16Z" stroke="#ffffff00" stroke-width="1" fill="#0c3b4d"/>
      <path d="M40 29C40 29 41 34 34 42 27 51 48 46 58 39 74 28 72 25 72 25L40 29Z" stroke="#ffffff00" stroke-width="1" fill="#006e96"/>
      <path d="M5 14C5 14 6 15 3 19 1 22 10 20 13 17 19 11 17 11 17 11L5 14Z" stroke="#ffffff00" stroke-width="1" fill="#006e96"/>
      <path d="M90 10C88 8 83 4 80 3 78 3 68 7 68 8 70 12 80 8 90 10Z" stroke="#ffffff00" stroke-width="1" fill="#0c3b4d"/>
      <path d="M89 9C87 7 82 3 79 2 77 2 67 6 67 7 69 11 79 7 89 9Z" stroke="#ffffff00" stroke-width="1" fill="#afe2ff"/>
    </g>
  </svg>
  <span class="cloud cloud--medium"></span>
  <span class="cloud cloud--large"></span>
</div>
<p class="whoami">Done with ♥ by <a href="https://twitter.com/b_lionel" title="follow me on twitter!">@b_lionel</a></p>
!

CSS 

              
                html{
  font-size:62.5%;
}
body{
  background: #f0f0e1;
  font:300 1.6em/1.4em Helvetica, Arial, "sans-serif";
}
h1{padding:1.2em; text-align:center;}
.scene{position:relative;
  display:block; 
  margin:0 auto; 
  width:300px;
  height:200px; 
}
.plane,
.cloud{
  position:absolute;
}
/*plane animation*/
.plane{ 
  animation-duration: 1s;
  animation-name: anim-plane;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-timing-function:linear;
  
  animation-fill-mode:forwards;	   
  display:block;
  margin:0 auto;
  transform: translateY(80px);
  left:30%;
}

@keyframes anim-plane{ 
  to{
    transform:translateY(95px);
  }    
}


/* Cloud Animation */

@keyframes fade{
  0%{ opacity: 0;}
  10%{ opacity: 1;}
  90%{ opacity:1;}
  100%{ opacity:0;}
}

@keyframes move{  
  from{ 
    left:200px; 
  }
  to{ 
    left:0px; 
  }
}
 

.cloud{ 
  animation-duration:10s; 
  animation-name:move, fade;
  animation-direction: normal;
  animation-iteration-count:infinite;
  animation-timing-function:linear; 
  animation-fill-mode:both;	  
  
  display:block;
  background:url(data:image/svg+xml;base64,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);
  height:40px;
  width:53px;
  margin:0 auto;  
}
.cloud--small{
  animation-duration:6s; 
  top:65px;
  transform: scaleX(0.5) scaleY(0.5); 
}
.cloud--medium{ 
  animation-duration:5s;
  animation-delay:1s;
  top:95px;
  transform: scaleX(0.7) scaleY(0.7); 
}
.cloud--large{
  animation-duration:4.5s;
  animation-delay:2.5s;
  top:95px;
  transform: scaleX(0.8) scaleY(0.8); 
}

.whoami{
  padding-top:3em;
  text-align:center;  
}
!

JS 

              
                /* Look Ma', No JS ! */
!
999px

Console