body { font-family: Arial; margin:0; background:#f5f5f5; }

.header {
    background:#2e7d32;
    color:#fff;
    display:flex;
    justify-content:space-between;
    padding:10px;
}

.grid {
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
    gap:20px;
    padding:20px;
}

.product {
    background:#fff;
    padding:10px;
    border-radius:10px;
    text-align:center;
}