console 命令行工具 X clear
console
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        div {
            width: 380px;
            height: 200px;
            margin: 150px;
            background-color: #00beff;
            animation: movediv 2s;
            border-radius: 50%;

        }
        @keyframes movediv {
            to {
                transform-origin: left top;
                transform: rotate(90deg);
                background-color: blue;
            }
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>