How to underline blank space in CSS?

Question

I am making a report that should be printable from the web browser. At the bottom is a field for the recipient to fill in, so it's underlined. I would rather not have to eyeball a certain number of underscores, and they seem to have gaps in them anyway.

What I am going for is...

Amount Paid: $ ___________________

So far, I have managed this CSS:

<div>
    <p style="border-bottom: 1px solid black;">
        Amount Paid: $ 
    </p>
</div>

That draws a line to the edge of the parent div - which I want. However, it also draws a line under "Amount Paid: $", which I don't want. Every combination of ps, spans, etc. I've thought of has failed:

If I put the text in a span that nukes the border, it doesn't matter, I suppose since it's still part of the p and the border is still drawn.

I can add the underline to a span after text, but that doesn't work. It only seems to want to underline the blank space when the border style is in the p element.

Likewise, if I replace the p with a span it doesn't get the memo that it should extend the border all the way:

<p>
    <span>Amount Paid: $ </span>
    <span style="border-bottom: 1px solid black;"> </span>
</p>

Does nothing. The line is never drawn. If I add a letter to the second span, it's drawn under that, but no more. And if I replace the p with anything else like divs or spans, it doesn't seem to work either...

Any ideas? Thanks in advance.

Answer 1

Change the display (CSS) of the second span to inline-block and set its width (CSS).

upd:

Or try something like:

<p style="width: 200px; display: table;">
  <span style="display: table-cell; width: 100px;">Amount Paid: $ </span>
  <span style="display: table-cell; border-bottom: 1px solid black;"></span>
</p>