[nabsltd]

I just re-formatted a book I bought, and hit this same issue. Here's what I used for some source code:

.div-indent {
	margin-left: 2em;
}
.div-computer {
	margin-top: 4%;
	margin-bottom: 4%;
	margin-left: 2em;
	margin-right: 2em;
	font-size: 90%;
	font-family: "Consolas", "Courier New", "Courier Std", "Courier", "DejaVu Sans Mono", monospace;
}
.para-left {
	text-align: left;
}

<div class="div-computer">
  <p class="para-left">void main (void)</p>
  <div class="div-indent">
    <p class="para-left">{</p>
    <p class="para-left">char keyfile = fopen("108952.jpg");</p>
    <p class="para-left">char extract;</p>
    <p class="para-left">while (infile)</p>
    <div class="div-indent">
      <p class="para-left">{</p>
      <p class="para-left">extract = asc(least_sig_bit(keyfile) / 2)^6;</p>
      <p class="para-left">stdoutput(extract);</p>
      <p class="para-left">}</p>
    </div>
    <p class="para-left">}</p>
  </div>
</div>

No complaints about the code...I know it's not valid, but that's what was in the book. The attachment shows how it renders.