纯css3云彩动画效果

效果演示

黑天到白天的渐变过渡

HTML

<!doctype html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>纯css3云彩动画效果</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>

<!-- 代码部分begin -->
<div class="sky">
	<div class="clouds_one"></div>
	<div class="clouds_two"></div>
	<div class="clouds_three"></div>
</div>
<!-- 代码部分end -->

</body>
</html>

CSS

  html, body {
  margin: 0;
  padding: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;
  animation: sky_background 50s ease-out infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -ms-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

.sky .clouds_one {
  background: url("../images/cloud_one.png");
  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;
  animation: cloud_one 50s linear infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -ms-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

.sky .clouds_two {
  background: url("../images/cloud_two.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;
  animation: cloud_two 75s linear infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -ms-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

.sky .clouds_three {
  background: url("../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;
  animation: cloud_three 100s linear infinite;
  -webkit-transform: translate3d(0, 0, 0);
  -ms-transform: translate3d(0, 0, 0);
  -o-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

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

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

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

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

图片下载地址：

cloud_one.png

cloud_two.png

cloud_three.png

纯css3云彩动画效果

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