Line Number Row is overflowing when it's wrapped inside a fixed height div.

Step -1: Before filling an issue check out troubleshooting section

• Go to README.md#Troubleshooting

Step 0: Describe your environment

• OS: Mac OS Mojave
• diff2html version: 3.4.3
• Using diff2html directly or using diff2html-ui helper: diff2html directly
• Extra flags: _

Step 1: Describe the problem:

When wrapping the HTML coming from diff2html.html in fixed-sized div line numbers column seems to be broken.

The below screenshot best describes the issue,

Steps to reproduce:

const diffHtml = diff2html.html(diffString, {
                drawFileList: true,
                matching: "lines",
                outputFormat: 'side-by-side',
});
$content.html(diffHtml);

diff example:

===================================================================
--- backend-markdown
+++ frontend-markdown
@@ -3,11 +3,9 @@
 <a href="https://github.com/jgm/commonmark.js">commonmark.js</a>, the<br>
 JavaScript reference implementation.</p>
 <ol>
 <li>item one</li>
-<li>
-<p>item two</p>
-<ul>
+<li>item two<ul>
 <li>sublist</li>
 <li>sublist</li>
 </ul>
 </li>
@@ -17,11 +15,9 @@
 <a href="https://github.com/jgm/commonmark.js">commonmark.js</a>, the<br>
 JavaScript reference implementation.</p>
 <ol>
 <li>item one</li>
-<li>
-<p>item two</p>
-<ul>
+<li>item two<ul>
 <li>sublist</li>
 <li>sublist</li>
 </ul>
 </li>

Observed Results:

• What happened? This could be a description, log output, etc. Already explained above.

Expected Results:

• What did you expect to happen? Line numbers do not overflow.

Relevant Code:

Overridding the line number position fixes the issue,

.d2h-code-side-linenumber{
    position: relative;
}

[Shimada666]

modify css

.d2h-code-side-linenumber {
  position: relative;
  display: table-cell;
}
.d2h-code-side-line {
  padding: 0 0.5em;
}

have a try

[SherCong]

.d2h-wrapper {
    transform: translateZ(0);
 }
.d2h-diff-table {
    position: relative;
 }
.d2h-code-side-linenumber {
    position: fixed;
}

have a try ,that fixed my problem