CSS animation, absolute position go off screen to right and come back from left

I made this quickly just to show you the concept.

At first, I set the starting position of the cloud at 50px from the left, then I set an animation, but with only one iteration.

Then I made a second cloud with an infinite animation but I also set a delay on it. That way, you give the illusion that the first animation is looping, even if it's two different elements and animations.

This is the only way I can think using CSS only.

.wrapper {
  position: relative;
}

.clouds {
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: gray;
}

.clouds.cloud1 {
  left: 50px;
  animation: cloud1 20s linear 1;
}

.clouds.cloud2 {
  left: -50px;
  animation: cloud1 20s 10s linear 1;
}

@keyframes cloud1 {
  0% {
    left: 20px;
  }
  100% {
    left: 3000px;
  }
}

@keyframes cloud2 {
  0% {
    left: -50px;
  }
  100% {
    left: 3000px;
  }
}

<div class="wrapper">
	<div class="clouds cloud1"></div>
	<div class="clouds cloud2"></div>
</div>

Here's the solution I proposed in the comments before:

You can make an initial cloud (.initalCloud) that just slides out of the screen and gets replaced with the regular .firstCloud afterwards.

.clouds {
  position: relative;
  overflow: hidden;
  height: 400px;
}

.initialCloud {
  position: absolute;
  left: 100%;
  top: 150px;
  animation: moveFirst 5s linear .2s;
  animation-iteration-count: 1;
  width: 150px;
}

.firstCloud {
  position: absolute;
  left: -30%;
  top: 150px;
  animation: move 5s linear 5s infinite;
  width: 150px;
}

.secondCloud {
  position: absolute;
  left: -30%;
  top: 200px;
  animation: move 8s linear 0s infinite;
  width: 150px;
}

.thirdCloud {
  top: 250px;
  left: -30%;
  position: absolute;
  animation: move 11s linear 1s infinite;
  width: 150px;
}

@-webkit-keyframes move {
  from {
    left: -30%;
  }
  to {
    left: 100%;
  }
}

@-webkit-keyframes moveFirst {
  from {
    left: 50%;
  }
  to {
    left: 100%;
  }
}

<div class="clouds">
  <div class="initialCloud">
    <svg id="svgCloud" data-name="clouder" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 348 164"><defs><style>.cloud1Fill{fill:#d1dbd9;}</style></defs><title>Untitled-5</title><path class="cloud1Fill" d="M348,107.5a54.5,54.5,0,0,1-94.87,36.61,77.55,77.55,0,0,1-81.57-1.43A73,73,0,0,1,71,145.07,42.48,42.48,0,1,1,49.61,71.59,73,73,0,0,1,154.85,26.84,77.51,77.51,0,0,1,287.16,53.37,53,53,0,0,1,293.5,53,54.5,54.5,0,0,1,348,107.5Z"/></svg>
  </div>
  <div class="firstCloud">
    <svg id="svgCloud" data-name="clouder" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 348 164"><defs><style>.cloud1Fill{fill:#d1dbd9;}</style></defs><title>Untitled-5</title><path class="cloud1Fill" d="M348,107.5a54.5,54.5,0,0,1-94.87,36.61,77.55,77.55,0,0,1-81.57-1.43A73,73,0,0,1,71,145.07,42.48,42.48,0,1,1,49.61,71.59,73,73,0,0,1,154.85,26.84,77.51,77.51,0,0,1,287.16,53.37,53,53,0,0,1,293.5,53,54.5,54.5,0,0,1,348,107.5Z"/></svg>
  </div>
  <div class="secondCloud">
    <svg id="svgCloud2" data-name="cloud2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 291 124"><defs><style>.cloud1Fill{fill:#d3dddb;}.cloud2Fill{fill:#fff;}</style></defs><title>Untitled-4</title><path class="cloud1Fill" d="M2.29,123.5A41,41,0,0,1,58.37,74.12l.32.14.24-.25A45.72,45.72,0,0,1,91.5,60.5q1.14,0,2.25.06l.43,0,.09-.41a76,76,0,0,1,148.46,0l.09.4h.41l1.27,0a46.06,46.06,0,0,1,46,46,45.53,45.53,0,0,1-3.26,17Z"/><path class="cloud2Fill" d="M168.5,1a75.53,75.53,0,0,1,73.74,59.23l.18.81.82,0,1.26,0a45.49,45.49,0,0,1,42.4,62H2.66A40.53,40.53,0,0,1,58.17,74.57l.63.29.49-.49A45.2,45.2,0,0,1,91.5,61c.75,0,1.5,0,2.23.06l.85,0,.18-.83A75.51,75.51,0,0,1,168.5,1m0-1A76.52,76.52,0,0,0,93.78,60.06Q92.66,60,91.5,60A46.35,46.35,0,0,0,58.58,73.66,41.52,41.52,0,0,0,1.92,124H287.58A46.5,46.5,0,0,0,244.5,60l-1.28,0A76.53,76.53,0,0,0,168.5,0Z"/></svg>
  </div>
  <div class="thirdCloud">
    <svg id="svgClouds3" data-name="clouds2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 329 139"><defs><style>.cloud2Fill{fill:#d1dbd9;}</style></defs><title>Untitled-6</title><path class="cloud2Fill" d="M329,125a40.09,40.09,0,0,1-2.52,14H14.9A61.28,61.28,0,0,1,0,99C0,64.21,29.33,36,65.5,36a67.34,67.34,0,0,1,30,7A86,86,0,0,1,236.42,31.37,55.53,55.53,0,0,1,311,83.5a56.67,56.67,0,0,1-.55,7.75A39.93,39.93,0,0,1,329,125Z"/></svg>
  </div>
</div>

use of left property instead of translateX() because you can use of percent in left and detect end screen.

.clouds {
  position: relative;
  overflow: hidden;
  height: 400px;
}

.firstCloud {
  position: absolute;
  left: -150px;
  top: 150px;
  animation: move 10s linear 2s infinite;
  width: 150px;
}

.secondCloud {
  position: absolute;
  left: -150px;
  top: 200px;
  animation: move 15s linear 0s infinite;
  width: 150px;
  }

.thirdCloud {
  top: 250px;
  left: -150px;
  position: absolute;
  animation: move 20s linear 5s infinite;
  width: 150px;
}

@-webkit-keyframes move {
  from {left: -150px;}
  to {left: 100%;}
}

  <div class="clouds">
    <div class="firstCloud">        
        <svg id="svgCloud" data-name="clouder" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 348 164"><defs><style>.cloud1Fill{fill:#d1dbd9;}</style></defs><title>Untitled-5</title><path class="cloud1Fill" d="M348,107.5a54.5,54.5,0,0,1-94.87,36.61,77.55,77.55,0,0,1-81.57-1.43A73,73,0,0,1,71,145.07,42.48,42.48,0,1,1,49.61,71.59,73,73,0,0,1,154.85,26.84,77.51,77.51,0,0,1,287.16,53.37,53,53,0,0,1,293.5,53,54.5,54.5,0,0,1,348,107.5Z"/></svg>
    </div>  
    <div class="secondCloud">
        <svg id="svgCloud2" data-name="cloud2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 291 124"><defs><style>.cloud1Fill{fill:#d3dddb;}.cloud2Fill{fill:#fff;}</style></defs><title>Untitled-4</title><path class="cloud1Fill" d="M2.29,123.5A41,41,0,0,1,58.37,74.12l.32.14.24-.25A45.72,45.72,0,0,1,91.5,60.5q1.14,0,2.25.06l.43,0,.09-.41a76,76,0,0,1,148.46,0l.09.4h.41l1.27,0a46.06,46.06,0,0,1,46,46,45.53,45.53,0,0,1-3.26,17Z"/><path class="cloud2Fill" d="M168.5,1a75.53,75.53,0,0,1,73.74,59.23l.18.81.82,0,1.26,0a45.49,45.49,0,0,1,42.4,62H2.66A40.53,40.53,0,0,1,58.17,74.57l.63.29.49-.49A45.2,45.2,0,0,1,91.5,61c.75,0,1.5,0,2.23.06l.85,0,.18-.83A75.51,75.51,0,0,1,168.5,1m0-1A76.52,76.52,0,0,0,93.78,60.06Q92.66,60,91.5,60A46.35,46.35,0,0,0,58.58,73.66,41.52,41.52,0,0,0,1.92,124H287.58A46.5,46.5,0,0,0,244.5,60l-1.28,0A76.53,76.53,0,0,0,168.5,0Z"/></svg>
    </div>
    <div class="thirdCloud">
        <svg id="svgClouds3" data-name="clouds2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 329 139"><defs><style>.cloud2Fill{fill:#d1dbd9;}</style></defs><title>Untitled-6</title><path class="cloud2Fill" d="M329,125a40.09,40.09,0,0,1-2.52,14H14.9A61.28,61.28,0,0,1,0,99C0,64.21,29.33,36,65.5,36a67.34,67.34,0,0,1,30,7A86,86,0,0,1,236.42,31.37,55.53,55.53,0,0,1,311,83.5a56.67,56.67,0,0,1-.55,7.75A39.93,39.93,0,0,1,329,125Z"/></svg>
    </div>    
</div>

Use jquery if you want starts animation of middle screen Just for one time:

$(document).ready(function(){
  $('.firstCloud,.secondCloud,.thirdCloud').animate({
     left:"100%"
  },10000,function(){$(this).addClass('anim')})
})

.clouds {
  position: relative;
  overflow: hidden;
  height: 400px;
}

.firstCloud {
  position: absolute;
  left: 0;
  top: 150px;
  animation-duration: 10s;
  animation-delay: 2s;
  width: 150px;
}

.secondCloud {
  position: absolute;
  left:  50%;
  top: 200px;
  animation-duration: 15s;
  width: 150px;
  }

.thirdCloud {
  top: 250px;
  left: 10%;
  position: absolute;
  animation-duration: 20s;
  animation-delay: 2s;
  width: 150px;
}


.anim {
  animation-name: move;
  animation-iteration-count: infinite;
}

@-webkit-keyframes move {
  from {left: -150px;}
  to {left: 100%;}
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="clouds">
    <div class="firstCloud">        
        <svg id="svgCloud" data-name="clouder" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 348 164"><defs><style>.cloud1Fill{fill:#d1dbd9;}</style></defs><title>Untitled-5</title><path class="cloud1Fill" d="M348,107.5a54.5,54.5,0,0,1-94.87,36.61,77.55,77.55,0,0,1-81.57-1.43A73,73,0,0,1,71,145.07,42.48,42.48,0,1,1,49.61,71.59,73,73,0,0,1,154.85,26.84,77.51,77.51,0,0,1,287.16,53.37,53,53,0,0,1,293.5,53,54.5,54.5,0,0,1,348,107.5Z"/></svg>
    </div>  
    <div class="secondCloud">
        <svg id="svgCloud2" data-name="cloud2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 291 124"><defs><style>.cloud1Fill{fill:#d3dddb;}.cloud2Fill{fill:#fff;}</style></defs><title>Untitled-4</title><path class="cloud1Fill" d="M2.29,123.5A41,41,0,0,1,58.37,74.12l.32.14.24-.25A45.72,45.72,0,0,1,91.5,60.5q1.14,0,2.25.06l.43,0,.09-.41a76,76,0,0,1,148.46,0l.09.4h.41l1.27,0a46.06,46.06,0,0,1,46,46,45.53,45.53,0,0,1-3.26,17Z"/><path class="cloud2Fill" d="M168.5,1a75.53,75.53,0,0,1,73.74,59.23l.18.81.82,0,1.26,0a45.49,45.49,0,0,1,42.4,62H2.66A40.53,40.53,0,0,1,58.17,74.57l.63.29.49-.49A45.2,45.2,0,0,1,91.5,61c.75,0,1.5,0,2.23.06l.85,0,.18-.83A75.51,75.51,0,0,1,168.5,1m0-1A76.52,76.52,0,0,0,93.78,60.06Q92.66,60,91.5,60A46.35,46.35,0,0,0,58.58,73.66,41.52,41.52,0,0,0,1.92,124H287.58A46.5,46.5,0,0,0,244.5,60l-1.28,0A76.53,76.53,0,0,0,168.5,0Z"/></svg>
    </div>
    <div class="thirdCloud">
        <svg id="svgClouds3" data-name="clouds2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 329 139"><defs><style>.cloud2Fill{fill:#d1dbd9;}</style></defs><title>Untitled-6</title><path class="cloud2Fill" d="M329,125a40.09,40.09,0,0,1-2.52,14H14.9A61.28,61.28,0,0,1,0,99C0,64.21,29.33,36,65.5,36a67.34,67.34,0,0,1,30,7A86,86,0,0,1,236.42,31.37,55.53,55.53,0,0,1,311,83.5a56.67,56.67,0,0,1-.55,7.75A39.93,39.93,0,0,1,329,125Z"/></svg>
    </div>    
</div>

I set a keyframe 50% and 50.001% to make cloud teleport right to left. Here is code pen: https://codepen.io/sqfkw1578/pen/abzypXN?editors=1100

body {
  overflow: hidden;
}

#svgCloud {
  position: relative;
  height: 100px;
  width: 100px;
  animation: move 4s linear infinite;
  margin-left: 50vw;
  margin-top: 50vh;
  transform: translateX(-50%) translateY(-50%);
}

@keyframes move {
  50% {
    transform: translateX(50vw) translateY(-50%);
  }
  50.001% {
    transform: translateX(-60vw) translateY(-50%);
  }
}

<svg id="svgCloud" data-name="clouder" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 348 164"><defs><style>.cloud1Fill{fill:#d1dbd9;}</style></defs><title>Untitled-5</title><path class="cloud1Fill" d="M348,107.5a54.5,54.5,0,0,1-94.87,36.61,77.55,77.55,0,0,1-81.57-1.43A73,73,0,0,1,71,145.07,42.48,42.48,0,1,1,49.61,71.59,73,73,0,0,1,154.85,26.84,77.51,77.51,0,0,1,287.16,53.37,53,53,0,0,1,293.5,53,54.5,54.5,0,0,1,348,107.5Z"/></svg>

CSS animation, absolute position go off screen to right and come back from left

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