css 动画之什么勒

效果静态图，就是一个小红块在框里面运动，经过的地方，文本为白色，背景为红色
下面时很low的代码，之所以low是因为还有很多地方要改
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .box{
            position: relative;
            display: inline-block;
            margin: 50px;
            width: 50px;
            height: 50px;
            border: 1px solid #000;
        }
        .box .item,
        .box .move{
            position: absolute;
            width: 100%;
            height: 100%;
            left: 0;
            top: 0;
        }
        .line{
            display: flex;
        }
        span{
            width: 25px;
            height: 25px;
            text-align: center;
            line-height: 25px;
        }
        .move span{
            position: absolute;
            overflow: hidden;
            background-color: red;
            color: #fff;
        }
        .move .item_1{
            right: 50%;
            bottom: 50%;
            animation: move_1 2s infinite;
        }
        .move .item_2{
            left: 50%;
            bottom: 50%;
            animation: move_2 2s infinite;
        }
        .move .item_4{
            left: 50%;
            top: 50%;
            animation: move_3 2s 0.5s infinite;
        }
        .move .item_3{
            top: 50%;
            right: 50%;
            animation: move_4 2s 1s infinite;
        }
        @keyframes move_1
        {
            0% {
                width: 25px;
                height: 25px;
            }
            25% {
                width: 0;
                height: 25px;
            }
            50%{
                width: 0;
                height: 0;
            }
            75%{
                width: 25px;
                height: 0;
            }
            100%{
                width: 25px;
                height: 25px;
            }
        }
        @keyframes move_2
        {
            0% {
                width: 0;
                height: 25px;
            }
            25% {
                width: 25px;
                height: 25px;
            }
            50%{
                width: 25px;
                height: 0;
            }
            75%{
                width: 0;
                height: 0;
            }
            100%{
                width: 0;
                height: 25px;
            }
        }
        @keyframes move_3
        {
            0% {
                width: 25px;
                height: 0;
            }
            25% {
                width: 25px;
                height: 25px;
            }
            50%{
                width: 0;
                height: 25px;
            }
            75%{
                width: 0;
                height: 0;
            }
            100%{
                width: 25px;
                height: 0;
            }
        }
        @keyframes move_4
        {
            0% {
                width: 0;
                height: 25px;
            }
            25% {
                width: 25px;
                height: 25px;
            }
            50%{
                width: 25px;
                height: 0;
            }
            75%{
                width: 0;
                height: 0;
            }
            100%{
                width: 0;
                height: 25px;
            }
        }
    </style>
</head>
<body>
<div class="box">
    <div class="item">
        <div class="line">
            <span class="item_1">吉</span>
            <span class="item_2">祥</span>
        </div>
        <div class="line">
            <span class="item_3">如</span>
            <span class="item_4">意</span>
        </div>
    </div>
    <div class="move">
        <div class="line">
            <span class="item_1">吉</span>
            <span class="item_2">祥</span>
        </div>
        <div class="line">
            <span class="item_3">如</span>
            <span class="item_4">意</span>
        </div>
    </div>
</div>
</body>
</html>
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