为什么我的旋转会抖动，该怎么修改

来源：2-18 编程练习

lala啦啦

2018-03-07 21:18:49

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>2-5</title>
    <style type="text/css">
        div {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            box-sizing: border-box;
            width: 400px;
            height: 400px;
            margin: auto;
            border: 1px solid red;
            border-bottom: 200px solid red;
            border-radius: 50%;
            transform-origin: 50% 50%;
            animation-name: rotate;
            animation-duration: 5s;
            animation-timing-function: linear;
            /*此处写代码*/
            animation-iteration-count:infinite;
        }
        div:before {
            content:"";
            display:block;
            width: 40px;
            height: 40px;
            background-color: #fff;
            border-radius: 50%;
            border: 80px solid red;
            float:left;
            margin-top:100px;
        }
        div:after {
            content:"";
            display:block;
            width: 40px;
            height: 40px;
            background-color: red;
            border-radius: 50%;
            border: 80px solid #fff;
            float:right;
            margin-top:-200px;
        }
        @keyframes rotate {
            from {transform:rotate(0deg)}
            to   {transform:rotate(360deg)}
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>

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