       width: 100%;
            height: 100%;
        }
        p{margin:0px}
    </style>

</head>

<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-tertiary">
        <div class="collapse navbar-collapse" id="navbar_3">
            <ul class="navbar-nav m-auto">
                <li class="nav-item">
                    <a class="nav-link" href="../index.html">基础展示 </a>
                </li>
                <li class="nav-item active">
                    <a class="nav-link" href="#">�