示例
04.CSS 动画效果| 仅使用 HTML 和 CSS
源码
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>CSS Animation Effects</title><link rel="stylesheet" type="text/css" href="style.css">
</head>
<body><div class="container"><div class="ring"></div><div class="ring"></div><div class="ri
