css让整个主页不全屏显示

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>不全屏显示的主页</title>
    <style>
        html, body {
            height: 100%;
            margin: 0;
            padding: 0;
        }
        .container {
            height: 80vh; /* 设置容器高度为视口高度的80% */
            background-color: #f0f0f0;
            display: flex;
            justify-content: center;
            align-items: center;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>欢迎来到我的主页</h1>
    </div>
</body>
</html>