$results = $mysqli->query("SELECT * FROM products ORDER BY id desc");
if ($results) {

    //fetch results set as object and output HTML
    while($obj = $results->fetch_object())
    {
        echo '<div class="product">';
        echo '<form method="post" action="cart_update.php">';
        echo '<div class="product-thumb"><img src="img/'.$obj->product_img_name.'"></div>';
        echo '<div class="product-content"><h3>'.$obj->product_name.'</h3>';
        //echo '<div class="product-desc">'.$obj->product_desc.'</div>';
        echo '<div class="product-info">';
        echo 'Price '.$currency.$obj->price.' | ';
        echo 'Qty <input type="text" name="product_qty" value="1" size="3" />';
        echo '<button class="btn btn-warning btn-xs"">Add To Cart</button>';
        echo '</div></div>';
        echo '<input type="hidden" name="product_code" value="'.$obj->product_code.'" />';
        echo '<input type="hidden" name="type" value="add" />';
        echo '<input type="hidden" name="return_url" value="'.$current_url.'" />';
        echo '</form>';
        echo '</div>';
    }

}

.product {
  display:inline;
}

.product * {
  display:inline;
}