body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #222;
    color: white;
    font-family: Arial, sans-serif;
    margin: 0;
}

.quiz-container {
    text-align: center;
    background: #333;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 6px 12px rgba(0, 0, 0, 0.5);
    width: 80%;
    max-width: 500px;
}

h1 {
    color: #ffcd1c;
}

.progress-bar-container {
    width: 100%;
    height: 10px;
    background: #444;
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 20px;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: #ffcd1c;
    transition: width 0.5s ease-in-out;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    margin: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

#btn-1 {
    background-color: #4caf50;
    color: white;
}

#btn-2 {
    background-color: #ad0606;
    color: white;
}

button:hover {
    transform: scale(1.1);
}

p {
    visibility: hidden;
    font-size: 18px;
    margin-top: 20px;
}

.correct {
    color: green;
    visibility: visible;
}

.wrong {
    color: red;
    visibility: visible;
}