CSS背景动画在很长时间内一直是一个热门话题，主要因为不需要额外的元素，看起来效果也不错。如果是有多重背景的CSS动画呢，下面我们来看下是如何实现的。
先上个效果图：

多重背景的CSS动画效果图

CSS代码

[css]
@keyframes animatedBird {
from {
background-position: 20px 20px, 30px 80px, 0 0;
}
to {
background-position: 300px -90px, 30px 20px, 100% 0;
}
}
@-webkit-keyframes animatedBird {
from {
background-position: 20px 20px, 30px 80px, 0 0;
}
to {
background-position: 300px -90px, 30px 20px, 100% 0;
}
}
@-ms-keyframes animatedBird {
from {
background-position: 20px 20px, 30px 80px, 0 0;
}
to {
background-position: 300px -90px, 30px 20px, 100% 0;
}
}
@-moz-keyframes animatedBird {
from {
background-position: 20px -90px, 30px 80px, 0 0;
}
to {
background-position: 300px -90px, 30px 20px, 100% 0;
}
}
.animate-area2 {
width: 560px;
height: 190px;
background-image: url(twitter-logo-bird.png), url(treehouseFrog.png), url(bg-clouds.png);
background-position: 20px -90px, 30px 80px, 0px 0px;
background-repeat: no-repeat, no-repeat, repeat-x;
animation: animatedBird 4s linear infinite;
-ms-animation: animatedBird 4s linear infinite;
-moz-animation: animatedBird 4s linear infinite;
-webkit-animation: animatedBird 4s linear infinite;
overflow: hidden;
}

[/css]

HTML代码

[html]<div class="animate-area2"></div>
[/html]

demo演示地址:http://www.w3cways.com/example?pid=1198