body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}
h1 {
    text-align: center;
    margin-top: 30px;
}
#search-form, #flight-cards {
    max-width: 800px;
    margin: 30px auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}