Main Menu formatting issues with Front Page Slider

Hello,
I am also having problems with my menu on mobile device.
Did you solve your problem?
I am trying get help, but with no answers.
I really need help. I am a beginner.

Well,
here is my last post asking for help:

Maybe you can try the custom css on nirvana settings:
/* Control width of 3-bar menu */
@media screen and (max-width: 979px) {
.navbar.resp .nav-collapse {
width: 25%;
}

It did not wok for me, but…

I have two major problems to divulgate my website.
https://www.arq.ufmg.br/prj/

1- Menu is not working in mobile divice.(is working nice on my computer

and others)
Above are the changes that i made.

Obs: if i disable the responsiveness from the Nirvana settings, i dont

know wy but work better on my mobile. At the same time, this style.css:
Custum css:
/* Control width of 3-bar menu */
@media screen and (max-width: 979px) {
.navbar.resp .nav-collapse {
width: 25%;
}
}

Style.css:
/* =Menu -PRIMARY
————————————————————– */

#nav-toggle { display: none; }

#access {
display: block;
float: right;
margin-right: 250px;
width: 550px;

}
doesn′t work.

I am a beginner in wordprees and i dont know codes(just a little bit).

So i really need help. Someone one, Please?

2- Slides in my homepage.
I already asked for help but with no answer.
if i am login, editing the homepage, when i view the slide is working really nice.
But once i am logout, only in the homepage the slide stop to work. You can check others pages as: sobre, chefia, etc.

My site is: https://www.arq.ufmg.br/prj/