css - 11transition 过渡效果

<!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>transition过渡效果</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        main {
            width: 100vw;
            height: 100vh;
            background: #2c3e50;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        main div {
            width: 150px;
            height: 150px;
            box-sizing: border-box;
            background-color: #fff;
            border: solid 10px #ccc;
            /*从最终状态到初始状态的过渡时间*/
            transition: 2s;
        }

        main div:hover {
            /*从初始状态到最终状态的过渡时间(如果不写会继承)*/
            transition: 5s;
            border-radius: 50%;
            border: dotted 20px #ddd;
            background-color: #e67e22;
        }
    </style>
</head>

<body>

<main>
    <div></div>
</main>

</body>
</html>