how to change width of <th> without affecting <td> width - html

Question

I have here 2 photos. 1 is my HTML page and the other one is my print page.
My question is, how am I going to make my print page the same as my html page? As you can see, the print page is less wide than the HTML page.
Also, I want to ask how am I going to make the width of <th> longer without affecting the width of <td>? Is that possible?
Sorry, I don't have that much knowledge in CSS.
Print Page
HTML Page
and here is my code:
<table width="100%" border="1">
<tr>
<th align="left" width="20%">II. Documentation</th>
</tr>
<tr>
<td align="center">Subject Routine</td>
<td width="20%" align="center">Person-in-charge</td>
<td width="15%" align="center">Complied</td>
<td width="10%" align="center">Date</td>
<td width="17%" align="center">Remarks</td>
<td align="center">Signature</td>
</tr>
<tr>
<td>1. Travel Documents</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>2. National License</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>3. NAC Certificates/MARINA COP</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>4. Medical</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>5. POEA / AMOSUP Contracts</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>6. Flag License</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>7. US Visa</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>8. Joining Port Visa</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>9. Other Certificate</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</table>

Answer 1

To get a nice print page width use media queries for example:
#media print {
#page {
margin: 30mm;
size:297mm 210mm;
}
}
Or use diffent stylesheets with different widths in stead of the same 100%
<link href="style.css" rel="stylesheet" type="text/css" media="screen">
<link href="style_print.css" rel="stylesheet" type="text/css" media="print">
And in the style.css add:
table {width:100%}
And in style_print.css add:
table {width:297mm}
Play with the widths untill you are happy in both ;)
Here are some great posts on how to set up CSS for printing:
https://www.smashingmagazine.com/2011/11/how-to-set-up-a-print-style-sheet/
https://www.smashingmagazine.com/2015/01/designing-for-print-with-css/
Just add colspan="6" to your th to set the correct width of your first cell.
<table width="100%" border="1">
<tr>
<th colspan="6" align="left" width="20%">II. Documentation</th>
</tr>
<tr>
<td align="center">Subject Routine</td>
<td width="20%" align="center">Person-in-charge</td>
<td width="15%" align="center">Complied</td>
<td width="10%" align="center">Date</td>
<td width="17%" align="center">Remarks</td>
<td align="center">Signature</td>
</tr>
<tr>
<td>1. Travel Documents</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>2. National License</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>3. NAC Certificates/MARINA COP</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>4. Medical</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>5. POEA / AMOSUP Contracts</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>6. Flag License</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>7. US Visa</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>8. Joining Port Visa</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>9. Other Certificate</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</table>

Answer 2

Tip: When I don't know what my html elements are doing I give them a border so I can see how they are behaving. In this case you don't have the same amount of <th> cells as <td> cells - just add a colspan=6 ( the same number of cells you have ) and your <th> cell will span across the whole table:
<tr>
<th colspan="6" align="left">II. Documentation</th>
</tr>
also you don't require the width unless you are trying to wrap the text ( but it sounds like you aren't. ) ...
oh, nevermind... answered above