body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        .container {
            background-color: white;
            padding: 20px;
            margin-bottom: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        h2 {
            color: #333;
            border-bottom: 2px solid #4CAF50;
            padding-bottom: 10px;
        }
        input, button {
            padding: 8px;
            margin: 5px;
            border: 1px solid #ddd;
            border-radius: 4px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            cursor: pointer;
        }
        button:hover {
            background-color: #45a049;
        }
        #hasil {
            font-weight: bold;
            margin-top: 10px;
            color: #333;
        }
        ul {
            list-style-type: none;
            padding: 0;
        }
        li {
            background-color: #f9f9f9;
            padding: 10px;
            margin: 5px 0;
            border-radius: 4px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .delete-btn {
            background-color: #f44336;
        }
        .delete-btn:hover {
            background-color: #d32f2f;
        }
        #jam-digital {
            font-size: 24px;
            font-weight: bold;
            text-align: center;
            margin: 20px 0;
            color: #333;
        }
        #kalender {
            font-size: 18px;
            text-align: center;
            margin-bottom: 20px;
            color: #555;
        }
        .quiz-container {
            margin-top: 20px;
        }
        .soal {
            margin-bottom: 20px;
            padding: 15px;
            background-color: #f9f9f9;
            border-radius: 4px;
        }
        .opsi {
            margin: 5px 0;
        }
        #skor-container {
            margin-top: 20px;
            padding: 15px;
            background-color: #e8f5e9;
            border-radius: 4px;
            display: none;
        }