body {
    font-family: Arial;
    padding: 20px;
}
input, button {
    margin: 5px 0;
    padding: 8px;
    width: 100%;
    max-width: 400px;
}
.productSet {
    border: 1px solid #ccc;
    padding: 10px;
    margin-bottom: 10px;
}
button {
    background: #28a745;
    color: white;
    border: none;
    cursor: pointer;
}
@media (min-width: 768px) {
    input, button {
        max-width: 600px;
    }
}