The slider which is on home page of my site of Art blog Theme is not working!

Hello iThemer

This is a great theme, really like using it for my blog.
Recently I noticed that the blog navigation in the post that lets you navigate between the latest posts is not fitting on the mobile screen, the arrows go off the mobile screen.

HI,

I m running and configuring a fresh install of wp at
https://www.robertobellino.com.

I personalized some police dimension in the span.site-name and span.name-description of the #logo’s div in headers, modifing them at :

#logo{
    margin-top: 0px;
background-color: #E7E3C9;
width: 200px;
padding-bottom: 5px;
}

#logo .site-name
{
font-size: 25px;
margin: 5px;
}

#logo .site-description
{
font-size: 16px;
margin: 5px;
}

everything seems to works good
but after few minutes the site info and name disappered.

Any suggestion about where the error can be searched at?

I tryied setting those valours back to the originals, nothing changed,
i verified the function.php page, everything is unchanged.
I dunno where to search else.

Thanks for any help