#car-calc-wrapper {
    max-width: 500px;
    margin: 30px auto;
    background: #f9f9f9;
    border: 1px solid #ddd;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
#car-calc-wrapper h2 {
    text-align: center;
}
#car-calc-wrapper label {
    display: block;
    margin-bottom: 15px;
}
#car-calc-wrapper input,
#car-calc-wrapper select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
}
#car-calc-wrapper button {
    margin-top: 10px;
    padding: 10px;
    width: 100%;
    background: #0073aa;
    color: white;
    border: none;
    border-radius: 4px;
}
#car-calc-wrapper #result {
    font-weight: bold;
    margin-top: 15px;
    text-align: center;
}