index.html

<!doctype html>
<html class="no-js" lang="en" dir="ltr">
<head>
    <base href="./"/>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>智能运维监管平台</title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="theme-color" content="#000000">
    <link rel="manifest" href="manifest.webapp"/>
    <link href="javascript/layui-2.3.0/css/layui.css" type="text/css" rel="stylesheet"/>
    <link rel="stylesheet"  href="javascript/jtopo/css/jtopo-editor.css"/>
    <script src="javascript/jquery-3.3.1/jquery-3.3.1.min.js" type="text/javascript"></script>
    <script src="javascript/layui-2.3.0/layui.all.js" type="text/javascript"></script>
    <script src="javascript/jtopo/js/util.js" type="text/javascript"></script>
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    <script src="javascript/jtopo/js/jtopo-editor.js" type="text/javascript"></script>
</head>
<style>
    html, body {
        width: 100%;
        height: 100%;
        font-weight: 400;
    }
    body{
        padding-right: 0 !important;
    }
    .square-flip {
        position: relative;
        width: 100%;
        height: 100%;
        overflow: visible;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .square-flip .flip {
        position: absolute;
        display: block;
        height: 40px;
        width: 40px;
        background-color: #404751;
        animation: rotateplane 1.5s infinite linear;
    }

    @keyframes rotateplane {
        0% {
            transform: rotateX(0);
        }
        25% {
            transform: rotateX(90deg);
        }
        50% {
            transform: rotateY(0deg);
        }
        75% {
            transform: rotateY(90deg);
        }
        100% {
            transform: rotate3d(0, 0, 0, 0);
        }
    }

</style>
<body>
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<p class="browserupgrade">You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade
    your browser</a> to improve your experience.</p>
<![endif]-->
<app-root>
    <div class="square-flip">
        <i class="flip"></i>
    </div>
</app-root>
<noscript>
    <h1>You must enable javascript to view this page</h1>
</noscript>
</body>
</html>