body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header, footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
}

.product-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.product {
    border: 1px solid #ccc;
    margin: 10px;
    padding: 10px;
    width: calc(30% - 20px);
    text-align: center;
}

.product img {
    max-width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    .product-list {
        flex-direction: column;
        align-items: center;
    }

    .product {
        width: 100%; /* Mobilde tam genişlik */
        margin: 10px 0;
    }
}

@media (min-width: 769px) {
    .product {
        width: calc(30% - 20px); /* Daha geniş ekranlar için */
    }
}