老师,怎样才能把代码写的简练些.总觉得很冗长

<!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>
        *{
            padding: 0;
            margin: 0;
        }
        .no0{
            width: 800px;
            height: 800px;
            border: 1px solid #000;
            margin: 50px auto;
            padding: 100px;
            border-radius: 50%;
        }
        .no0 .box{
            width: 200px;
            height: 200px;
            margin: 100px;
            position: relative;
            float: left;
            perspective: 500px;
        }
        .no0 .box::before{
            content: '';
            display: block;
            width: 200px;
            height: 200px;
            background: url(cat.jpg) no-repeat center/100%;
            border-radius: 50%;
            border: 1px solid #000;
        }
        .no0 .box::after{
            content: '';
            display: block;
            width: 200px;
            height: 200px;
            background: url(dog.jpg) no-repeat center/100%;
            position: absolute;
            top: 0;
            left: 0;
            border-radius: 50%;
            border: 1px solid #000;
            transform-origin: 0 0;
            transition: transform 1s linear 0s;
        }
        .no0 .box:hover::after{
            transform: rotateY(-180deg);
        }
        .no0 .no2::after{
            transform-origin: 100% 0;
        }
        .no0 .no2:hover::after{
            transform: rotateY(180deg);
        }
        .no0 .no3:hover::after{
            transform: rotateX(180deg);
        }
        .no0 .no4::after{
            transform-origin: 0 100%;
        }
        .no0 .no4:hover::after{
            transform: rotateX(-180deg);
        }
    </style>
</head>
<body>
    <div class="no0">
        <div class="box no1"></div>
        <div class="box no2"></div>
        <div class="box no3"></div>
        <div class="box no4"></div>
    </div>
</body>
</html>