style.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Centering Text</title>
    <style>
        html,
        body {
            height: 100%;
            margin: 0;
            display: flex;
            justify-content: center;
            /* Centers horizontally */
            align-items: center;
            /* Centers vertically */
            background-color: #333;
            /* Optional background color */
        }

        p {
            color: white;
            /* Text color */
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
            font-size: 20px;
            font-weight: 700;
            text-align: center;
            margin: 0;
            /* Reset default margin */
        }
    </style>
</head>

<body>
    <p>Centered Text</p>
</body>

</html>