index.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./index.css">
    <link rel="stylesheet" href="./form.css">
    <link rel="stylesheet" href="./output.css">
    <title>Form Output Number</title>
</head>

<body>
    <div id="ana-tag">


        <div id="body-tag">


            <div id="body-form">
                <fieldset>

                    <h2 id="tag-title"> POİNTS </h2>
                    <hr>
                    <form action="#">
                        <input type="number" name="number1" id="num-1" placeholder="points-1"><br>
                        <input type="number" name="number2" id="num-2" placeholder="points-2"><br>
                        <input type="number" name="number3" id="num-3" placeholder="points-3"><br>
                    </form>
                    <button id="calculate-points" onclick="calculates()"> Calculate </button>
                </fieldset>
            </div>

            <div id="body-output">
                <ul>
                    <li id="points">Points:</li>
                    <li id="averagePoints">Average Points:</li>
                    <li id="totalPoints"> Total Points :</li>
                </ul>
            </div>

        </div>

    </div>


    <script src="./index.js"></script>
</body>

</html>