index.html

<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>个人主页 首页</title>
    <link rel="stylesheet" type="text/css" href="theme.css">
</head>

<body>
    <div style="position: fixed ;">
        <div style="
        display:flex;
        background-color: yellow;">
            <ul style="display: flex;">
                <li class="dhlbk">
                    <a style="
            color:red;" href="./index.html">
                        <div class="dropdown">
                            主页一览
                        </div>
                    </a>
                </li>
                <li class="dhlbk">
                    <a style="
                    color:red;" href="./myself.html">
                        <div class="dropdown">
                            UP主页
                        </div>
                    </a>
                </li>
            </ul>
        </div>
    </div>
    <div style="display: flex;
    flex-direction: column;
    align-items:center;">
        <div>
            <h2>
                个人介绍
            </h2>
            <p>
                &nbsp;&nbsp;&nbsp;
            </p>
        </div>
    </div>
    <div></div>
</body>

</html>