实例：按钮边框动效
技术栈：HTML+CSS
效果：
源码：
【HTML】
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>按钮边框动效</title>
<link rel="stylesheet" href="224.css">
</head>
<body>
<div class="container">
<div class="button">
点赞
<div class="button-h"></div>
<div class="button-v"></div>
</div>
<div class="button">
关注
<div class="butt
