请老师检查下2-21的编程

来源：2-21 自由编程

鱼传奇

2022-03-06 09:49:17

<!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>
.out {
position: relative;
margin: 100px auto;
}
.in {
position: absolute;
top: 0;
left: 0;
animation: inToChange .8s ease-in 0s infinite alternate;
}
.out, .in{
width: 88px;
height: 81px;
background-image: url(../images/xin.png);
}
@keyframes inToChange {
from {
opacity: 0;
transform: scale(2);
}
to {
opacity: 1;
transform: scale(1);
}
}
</style>
</head>
<body>
<div class="out">
<div class="in"></div>
</div>
</body>
</html>

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