网页升级或即将到来页面（极简版）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>网站升级中</title>
    <style>
        /* 全局样式 */
        body, html {
            margin: 0;
            padding: 0;
            height: 100%;
            width: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
            overflow: hidden;
        }

        /* 提示框样式 */
        .message-box {
            padding: 20px;
            position: relative;
            text-align: center;
            font-size: 24px;
            color: #196aa8;
        }

        @keyframes flash {
            0% {
                opacity: 1;
            }
            50% {
                opacity: 0;
            }
            100% {
                opacity: 1;
            }
        }
        /*四角边框*/
        .rect {
            background: linear-gradient(to left, #196aa8, #196aa8) left top no-repeat,
            linear-gradient(to bottom, #196aa8, #196aa8) left top no-repeat,
            linear-gradient(to left, #196aa8, #196aa8) right top no-repeat,
            linear-gradient(to bottom, #196aa8, #196aa8) right top no-repeat,
            linear-gradient(to left, #196aa8, #196aa8) left bottom no-repeat,
            linear-gradient(to bottom, #196aa8, #196aa8) left bottom no-repeat,
            linear-gradient(to left, #196aa8, #196AA8) right bottom no-repeat,
            linear-gradient(to left, #196aa8, #196aa8) right bottom no-repeat;
            background-size: 2px 15px, 20px 2px, 2px 15px, 20px 2px;
        }
    </style>
</head>
<body>
<div class="message-box rect">
    网站正在升级中...
</div>
</body>
</html>
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