body {
    font-family: Arial, sans-serif;
    background: #f9f9f9;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 700px;
    margin: auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1 {
    text-align: center;
}
.question {
    margin-bottom: 20px;
}
.options button {
    display: block;
    width: 100%;
    margin: 5px 0;
    padding: 10px;
    border: 1px solid #ccc;
    background: #eee;
    cursor: pointer;
}
.options button.correct {
    background-color: #c8f7c5;
    border-color: #4CAF50;
}
.options button.incorrect {
    background-color: #f7c5c5;
    border-color: #f44336;
}
.options button.selected {
    background-color: #d0eaff;
    border-color: #3399ff;
    font-weight: bold;
}
img.question-img {
    max-width: 100%;
    height: auto;
    margin: 10px 0;
}