Replace button with icon

        <div id="term_bar"><progress id="net_progress"></progress></div>

    </div>

    <div id="controls">

        <h1>Pooltest Sommersemester 2022</h1>

        <h1>Pooltest Sommersemester 2022 <i class="bi bi-question-circle clickable" data-action="welcome-again" title="Willkommensnachricht erneut zeigen"></i></h1>

        <h2>Aufgaben</h2>

        <div id="exercises"></div>

        <h2>Optionen</h2>

        <ul>

            <li><button data-action="welcome-again">Willkommensnachricht erneut zeigen</button></li>

            <li><button data-action="hand-in">Abgeben</button></li>

        </ul>

        <button data-action="hand-in">Abgeben</button>

    </div>

    <div class="ribbon">Pre-Alpha</div>