Randomly changing top css property

[KaliszS]

Hi! I've come across a problem with css properties changing when refreshing a page. It's just markdown with an empty header (but the same issue occurs without it) and image:

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![Rust & Go for Python developers](src/header.png)

( source: https://github.com/KaliszS/PyGoRs/blob/main/src/header.md )

https://kaliszs.github.io/PyGoRs/ -> it randomly changes top property, this can occur every time the page is refreshed. The same happens on localhost.

Sometimes there is:

<section style="top: 322.5px; display: block;" data-markdown="" data-markdown-parsed="true" class="present">

and sometimes:

<section data-markdown="" data-markdown-parsed="true" style="top: 16.5px; display: block;" class="present">

Has anyone encountered such an error? Thank you in advance for your help! :)