   <div id="start-screen" class="screen">
            <div class="quiz-icon">
                <i class="fas fa-question-circle"></i>
            </div>
            <h1>Welcome to QuizMaster!</h1>
            <p class="intro-text">Choose a category and test your knowledge!</p>
            
            <div class="categories-grid">
                <div class="category-card" data-category="general">
                    <i class="fas fa-globe"></i>
                    <h3>General Knowledge</h3>
                