css弹出动画

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS 弹出动画示例</title>
    <style>
        .container {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .button {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
        }
        .content {
            opacity: 0;
            transition: opacity 0.5s ease-in-out;
        }
        .content.show {
            opacity: 1;
        }
    </style>
</head>
<body>
    <div class="container">
        <button class="button" onclick="toggleContent()">点击显示/隐藏内容</button>
        <div class="content" id="content">
            这是弹出的内容！
        </div>
    </div>

    <script>
        function toggleContent() {
            const content = document.getElementById('content');
            content.classList.toggle('show');
        }
    </script>
</body>
</html>