Logo disappear and menu cropped in mobile

Hello!

I ve gone through the forum and try out the solutions below, but unfortunately none has worked in my case.

.menu-top-navigation-menu-container {
margin-bottom: 100px;
}

#mobile-menu ul li a {
padding: 3px 20px;
font-size: 14px;
}

.menu-main-menu-container > ul {
margin-bottom: 100px;
}

#mobile-menu #menu-navigation {
margin-bottom: 60px;
}

ul#menu-cc-primary-menu { margin-bottom: 100px !important }

Can you please help me on these?
1. how to show the logo in the mobile appears?
2. how to make visible the last item in the mobile menu (call “Χρήσιμοι σύνδεσμοι”)? Please see also the attached file. Here it is also the site url: seva.com.gr

Thank you.