lepka stopa nie działa bootstrap
/* 2020 - bootstrap 4.5+
Note: - The flex-fill utility was included in Bootstrap 4.1 at later release.
So after that release the extra CSS for flex-fill won't be needed.
Additionally min-vh-100 is included in newer Bootstrap 4 releases */
<div class="d-flex flex-column min-vh-100">
<nav>
</nav>
<main class="flex-fill">
</main>
<footer>
</footer>
</div>
Black Bug