.banner {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 15px;
    box-sizing: border-box;
    background-color: #ffffff;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .banner {
        padding: 10px;
    }
}