多重CSS背景动画实现方法示例

.animate-area {
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;
}

@keyframes animatedBird {
from { background-position: 20px 20px, 30px 80px, 0 0; }
to { background-position: 300px -90px, 30px 20px, 100% 0; }
}
.animate-area {
animation: animatedBird 4s linear infinite;
}