CSS3 to achieve floating cloud animation

Operation effect

html

<head>
  <meta charset='UTF-8'>
  <title>CSS3 Cloud Animations By Montana Flynn</title>
</head>

<body>
  <div class="sky">
    <div class="moon"></div>
    <div class="clouds_two"></div>
    <div class="clouds_one"></div>
    <div class="clouds_three"></div>
  </div>
</body>

CSS

html, body {
  margin: 0;
  height: 100%
}

.sky {
  height: 480px;
  background: #007fd5;
  position: relative;
  overflow: hidden;
  -webkit-animation: sky_background 50s ease-out infinite;
  -moz-animation: sky_background 50s ease-out infinite;
  -o-animation: sky_background 50s ease-out infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0)
}

.moon {
  background: url("http://i.imgur.com/wFXd68N.png");
  position: absolute;
  left: 0;
  height: 300%;
  width: 300%;
  -webkit-animation: moon 50s linear infinite;
  -moz-animation: moon 50s linear infinite;
  -o-animation: moon 50s linear infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0)
}

.clouds_one {
  background: url("http://www.scri8e.com/stars/PNG_Clouds/zc06.png?filename=./zc06.png&w0=800&h0s=289&imgType=3&h1=50&w1=140");
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 300%;
  -webkit-animation: cloud_one 50s linear infinite;
  -moz-animation: cloud_one 50s linear infinite;
  -o-animation: cloud_one 50s linear infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0)
}

.clouds_two {
  background: url("http://freepngimages.com/wp-content/uploads/2016/02/clouds-transparent-background-2.png");
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 300%;
  -webkit-animation: cloud_two 75s linear infinite;
  -moz-animation: cloud_two 75s linear infinite;
  -o-animation: cloud_two 75s linear infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0)
}

.clouds_three {
  background: url("http://montanaflynn.me/lab/css-clouds/images/cloud_three.png");
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 300%;
  -webkit-animation: cloud_three 100s linear infinite;
  -moz-animation: cloud_three 100s linear infinite;
  -o-animation: cloud_three 100s linear infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0)
}

@-webkit-keyframes sky_background {
  0% {
    background: #007fd5;
    color: #007fd5
  }
  50% {
    background: #000;
    color: #a3d9ff
  }
  100% {
    background: #007fd5;
    color: #007fd5
  }
}

@-webkit-keyframes moon {
  0% {
    opacity: 0;
    left: -200% -moz-transform: scale(0.5);
    -webkit-transform: scale(0.5);
  }
  50% {
    opacity: 1;
    -moz-transform: scale(1);
    left: 0% bottom: 250px;
    -webkit-transform: scale(1);
  }
  100% {
    opacity: 0;
    bottom: 500px;
    -moz-transform: scale(0.5);
    -webkit-transform: scale(0.5);
  }
}

@-webkit-keyframes cloud_one {
  0% {
    left: 0
  }
  100% {
    left: -200%
  }
}

@-webkit-keyframes cloud_two {
  0% {
    left: 0
  }
  100% {
    left: -200%
  }
}

@-webkit-keyframes cloud_three {
  0% {
    left: 0
  }
  100% {
    left: -200%
  }
}

@-moz-keyframes sky_background {
  0% {
    background: #007fd5;
    color: #007fd5
  }
  50% {
    background: #000;
    color: #a3d9ff
  }
  100% {
    background: #007fd5;
    color: #007fd5
  }
}

@-moz-keyframes moon {
  0% {
    opacity: 0;
    left: -200% -moz-transform: scale(0.5);
    -webkit-transform: scale(0.5);
  }
  50% {
    opacity: 1;
    -moz-transform: scale(1);
    left: 0% bottom: 250px;
    -webkit-transform: scale(1);
  }
  100% {
    opacity: 0;
    bottom: 500px;
    -moz-transform: scale(0.5);
    -webkit-transform: scale(0.5);
  }
}

@-moz-keyframes cloud_one {
  0% {
    left: 0
  }
  100% {
    left: -200%
  }
}

@-moz-keyframes cloud_two {
  0% {
    left: 0
  }
  100% {
    left: -200%
  }
}

@-moz-keyframes cloud_three {
  0% {
    left: 0
  }
  100% {
    left: -200%
  }
}

The above is the details of how to achieve floating cloud animation with CSS3. For more information about CSS3 floating clouds, please pay attention to other related articles on 123WORDPRESS.COM!

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