0&display=swap" rel="stylesheet">
        <link rel="stylesheet" href="./styles.css">
        <title>Calculator</title>
    </head>
    <body>
        <h1>Basic math operation</h1>
        <h2>
            You entered <span class="accent" data-number="first"></span>
            and <span class="accent" data-number="second"></span>
        </h2>
        <ul>
            <li>
                Adding:    <span class="accent" data-operation="adding"></span>
            </li>
            <li>
                Subt