For me all lines are numbered with 01:

 Netscape
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:37.0) Gecko/20100101 Firefox/
+37.0

[download]

Since I couldn't guaranty that other settings aren't interfering (there are plenty after 7 years) I tried an alternative account and now it worked for me in FF.

Though testing on Safari/Android didn't show any numbers, but red source code... ¹

Consequence, CSS tricks are fragile and can easily interfere with other settings.

More elementary approaches like demonstrated in Metacpan or perlcommunity.de OTOH are well tested already.

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

¹) UPDATE: I was able to fix this, but line-breaks are still lost after copying!

In reply to Re^2: Change default style sheet: add line numbers by LanX
in thread Change default style sheet: add line numbers by roboticus

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.