请老师检查代码

来源：2-21 自由编程

wowawawoa

2021-03-03 16:17:03

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .box1,.box2 {
            width: 88px;
            height: 81px;
            margin: 100px auto;
            background-image: url(img/xin.png) ;
        }
        .box1 {
            position: relative;
        }
        .box2 {
            position: absolute;
            top: -100px;
            animation: xd 1s linear 0s infinite;
        }
        @keyframes xd {
            0% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(1.5);
            }
            100% {
                opacity: 0;
                transform: scale(2);
            }
        }
    </style>
</head>
<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>
</html>