body {
    background-color: white;
    color: black;
    font-family: Arial, sans-serif;
}
.quiz-container {
    max-width: 800px;
    margin: auto;
    padding: 20px;
    border: 2px solid blue;
}
.question {
    margin-bottom: 20px;
}
.options {
    list-style-type: none;
    padding: 0;
}
.options li {
    margin: 5px 0;
}
.option-btn {
    background-color: blue;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    display: block;
    width: 100%;
    text-align: left;
    margin-bottom: 5px;
}
.nav-btn {
    background-color: blue;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    display: inline-block;
    margin: 10px;
}
.submit-btn {
    background-color: blue;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    display: block;
    margin: 20px auto;
}
.hidden {
    display: none;
}
.score-container {
    max-width: 800px;
    margin: auto;
    padding: 20px;
    border: 2px solid blue;
    display: none;
}
.result {
    margin-bottom: 10px;
}
.correct {
    background-color: green;
}
.incorrect {
    background-color: red;
}