TCPDF表头自动向右移动

I have created a table with TCPDF. The header, which has a black background, has been positioned slightly to the right as though there is some padding on the left hand side. I cannot get it to line up correctly.

The code below is the HTML I have written to form the table.

$tbl ='<style>
th {background-color: black;color: white;float:left;}
.tal {text-align: left;float:left;}
</style>

<table border="0" cellspacing="0" cellpadding="0">
    <tr>
        <th width="60px" style="border-right: 1px solid white;"><strong>Qty</strong></th>
        <th width="1px"></th>
        <th class="tal" width="388px" style="padding:10px 0; border-right: 1px solid white;">     <strong>Product or Service</strong></th>
        <th width="1px"></th>
        <th width="84px" style="border-right: 1px solid white;"><strong>Price Each</strong></th>
        <th width="1px"></th>
        <th width="84px"><strong>Total</strong></th>
    </tr>
    
    <tr>
        <td height="267px">';
            while($i <= $a) {
                $tbl .= '<table height="267px" width="60px"><tr><td>' . $productsArray['product_quantity'][$i] . '</td></tr></table>';
                $i++;
            }
            $tbl .= '</td><td border="1" width="0.5px" height="267px" style="background:url(images/bars-black.jpg) bottom right no-repeat"></td><td height="267px">';
            while($j <= $a) {
                $tbl .= '<table height="267px" width="388px"><tr><td class="tal">     ' . $productsArray['product_name'][$j] . '</td></tr></table>';
                $j++;
            }
            $tbl .= '</td><td width="0.5px" height="267px" style="background:url(images/bars-black.jpg) bottom right no-repeat"></td><td height="267px">';
            while($k <= $a) {
                $tbl .= '<table height="267px" width="84px"><tr><td>' . $productsArray['product_price'][$k] . '</td></tr></table>';
                $k++;
            }
            $tbl .= '</td><td border="1" width="0.5px" height="267px" style="background:url(images/bars-black.jpg) bottom right no-repeat"></td><td height="267px">';
            while($l <= $a) {
                $tbl .= '<table height="267px" width="84px"><tr><td>' . $productsArray['product_sub'][$l] . '</td></tr></table>';
                $l++;
            }
$tbl .= '</td>
    </tr>
</table>';
}

The below code is the PHP I have used to show the table on the page.

$pdf->writeHTMLCell(175, 80, 20, 100, $tbl, 1, 1, 0, true, 'C', true);

</div>

Using tables within cells of another table is generally a really bad idea and is likely contributing to the problem you are having. Since it looks like your productsArray already has all of the data you need I would simply loop through it outputting each row as you go.

It's also worth pointing out that the empty header rows that are defined with a width of 1px conflict with your actual data rows which are defined with a width of 0.5px.

<style>
th {background-color: black;color: white;float:left;}
.tal {text-align: left;float:left;}
</style>

<table border="0" cellspacing="0" cellpadding="0">
    <tr>
        <th width="60px" style="border-right: 1px solid white;"><strong>Qty</strong></th>
        <th width="1px"></th>
        <th class="tal" width="388px" style="padding:10px 0; border-right: 1px solid white;">     <strong>Product or Service</strong></th>
        <th width="1px"></th>
        <th width="84px" style="border-right: 1px solid white;"><strong>Price Each</strong></th>
        <th width="1px"></th>
        <th width="84px"><strong>Total</strong></th>
    </tr>

<?php
while($i <= $a) {
?>
<tr>
    <td height="267px"><?php echo $productsArray['product_quantity'][$i]; ?></td>
    <td border="1" width="0.5px" height="267px" style="background:url(images/bars-black.jpg) bottom right no-repeat"></td>
    <td height="267px"><?php echo $productsArray['product_name'][$i]; ?></td>
    <td width="0.5px" height="267px" style="background:url(images/bars-black.jpg) bottom right no-repeat"></td>
    <td height="267px"><?php echo $productsArray['product_price'][$i]; ?></td>
    <td border="1" width="0.5px" height="267px" style="background:url(images/bars-black.jpg) bottom right no-repeat"></td>
    <td height="267px"><?php echo $productsArray['product_sub'][$l]; ?></td>
</tr>
<?php
    $i++;
}
?>
</table>