Bulma fixed bottom navbar scroll - javascript

I'm having a problem with this ""fixed"" bottom navbar.
It is realized with bulma v0.8.0 and it I want it to always be visible in the same way (with or without scrolling).
Below code of the bottom navbar:
<html lang="en" class="has-navbar-fixed-bottom">
[...]
<nav id="navbar-bottom" class="navbar is-fixed-bottom is-hidden-tablet" role="navigation" aria-label="main navigation">
<div class="navbar-brand">
<div class="columns flex-center">
<div class="column socialtext">Share</div>
[...]
</div>
</div>
</nav>
And the results is like:
When I try to scroll down, the navbar show "correctly".
I have tried with some js library but still does not work.
Could I have some tips about that?
Thanks,

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Go To Contact Form
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The goal is actually to change the collapse sidebar width but only on mobile version
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width: 100px;
}
Why is that happening !?
I really can't use the inline declaration because I need the use of #media in order to target only the mobile menu.
That's it, I found it !
I post here the answer for anyone looking for the same result :D
#mobile-menu-wrap
{
width: 10em;
}
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