styles.css

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f4f4f9;
    color: #333;
}

.container {
    width: 90%;
    max-width: 600px;
    margin-top: 20px;
    text-align: center;
}

.hidden {
    display: none;
}

.settings, #quizSection, #matrixSection, #errorSection {
    margin: 20px 0;
}

button {
    margin: 5px;
    padding: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button.danger {
    background-color: #f55;
    color: white;
}

#resultMatrix {
    width: 100%;
    border-collapse: collapse;
}

#resultMatrix td, #resultMatrix th {
    width: 10%;
    height: 40px;
    text-align: center;
    vertical-align: middle;
    border: 1px solid #ddd;
    font-weight: bold;
}

#resultMatrix th {
    background-color: #f0f0f0;
}

.cell {
    background-color: #d1d1d1;
}

.green {
    background-color: #a2e6a2;
}

#errorList {
    list-style-type: none;
    padding: 0;
    text-align: left;
}

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

.feedback {
    margin-top: 10px;
    font-size: 1.2em;
    font-weight: bold;
    transition: background-color 1s ease;
}

.feedback.correct {
    background-color: #a2e6a2;
    opacity: 1;
    transform: scale(1);
}

.feedback.incorrect {
    background-color: #f55;
    opacity: 1;
    transform: scale(1);
}