Create reveal effect for menu items when hovering using CSS

Site URL: https://ray-gecko-tfeg.squarespace.com/

Hi there, wondering if someone can help because this is driving me mad. 

I am trying to create a hover to reveal effect in my header navigation. See an example attached of what I'm trying to achieve. 

I was able to achieve this effect for regular text by inserting the following into a code block: 

<div id="hover-div">
  A<span id="hover-element">bout</span>
</div>

<div id="hover-div">
  C<span id="hover-element">ontact</span>
</div>

<div id="hover-div">
  S<span id="hover-element">ervices</span>
</div>

and then adding the following to the CSS editor: 

#hover-element {
  display: none;
  position: absolute;
}

#hover-div:hover #hover-element {
  display: inline !important;
}

This had the following effect on my actual page: 

I am wanting to do this effect with each menu item in the navigation header but can't seem to figure out the code to achieve this. Does anyone have any suggestions or code to achieve this? 

Test website is https://ray-gecko-tfeg.squarespace.com/ and the password is test1234 

Thanks in advance!

Still quite understand. Do you have an example demo/site/video?

Hey there! Sure, sorry for the confusion. 

See attached a screen recording showing what I'm trying to achieve in the header.

The site I am referencing is https://www.eyrc.com/. 

You can see on the site I'm building here https://ray-gecko-tfeg.squarespace.com/ (Password TEST1234). 

I was able to achieve this using a regular text block here: 

I just don't know how to achieve this in the header. Does that make more sense? 

Thanks!