Fatih Aydin writes:

> Write a code block in an org file and publish it to a html file. You
> will see that only bottom part of the name of the programming language
> is visible when you hover on it because of the css of that block
> (overflow:auto)
> To fix this, a margin-top can be added.

Ah, that's a nice visual improvement.  Thanks!

To more closely follow conventions for commit messages in this project
[1], I'd suggest to rewrite the message to something like this:

--8<---------------cut here---------------start------------->8---
Subject: [PATCH] ox-html: Add margin to fix overflow visibility problem

* lisp/ox-html.el (org-html-style-default): Add the margin-top
property to pre.src:hover:before so that the programming language is
fully visible.

TINYCHANGE
--8<---------------cut here---------------end--------------->8---

Does that look okay to you?  If so, I can amend your commit when
applying.  (I'll wait a few more days for any CSS gurus on the list to
weigh in.)

[1] https://orgmode.org/worg/org-contribute.html#commit-messages