body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f9;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    overflow-y: auto;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    box-sizing: border-box;
}

h1 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 20px;
}

label, select {
    font-size: 1rem;
    margin-right: 10px;
}

button {
    font-size: 1.2rem;
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

button:disabled {
    background-color: #ccc;
}

button:hover {
    background-color: #45a049;
}

select {
    padding: 5px;
    font-size: 1rem;
    border-radius: 5px;
}

#timer, #score {
    margin-top: 20px;
    font-size: 1.2rem;
    color: #333;
    text-align: center;
}

table {
    margin-top: 20px;
    border-collapse: collapse;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

th, td {
    padding: 15px;
    text-align: center;
    border: 1px solid #ddd;
    width: 50px;
    height: 50px;
}

th {
    background-color: #4CAF50;
    color: white;
}

input {
    width: 40px;
    text-align: center;
    border-radius: 5px;
    border: 1px solid #ddd;
    font-size: 1rem;
}

input:focus {
    outline: none;
    border: 2px solid #4CAF50;
}

.correct {
    background-color: #8bc34a;
}

.incorrect {
    background-color: #f44336;
}

.feedback-container {
    margin-top: 30px;
    width: 90%;
    max-width: 800px;
    overflow-y: auto;
    max-height: 300px;
}

.feedback-container ul {
    list-style-type: none;
    padding-left: 0;
}

.feedback-container li {
    font-size: 1rem;
    color: #333;
    margin: 5px 0;
}

.feedback-container strong {
    font-size: 1.2rem;
}

@media (max-width: 600px) {
    table {
        width: 90%;
    }

    th, td {
        font-size: 1rem;
        padding: 10px;
    }

    input {
        width: 35px;
    }

    button {
        padding: 8px 15px;
        font-size: 1rem;
    }
}