Hyperlink Shadow

It is not a shadow. It is a gradient for the background image of the link.
The CSS which creates it is

a:hover, a:focus, a:active {
	color: red;
	background-image: radial-gradient(circle, rgba(245, 245,160,0.9) 30%, transparent);
	background-image: radial-gradient(circle at calc(100% * var(--mouse-x)) calc(100% * var(--mouse-y)),
		rgba(255, 235, 80, 0.8) 10%, rgba(245, 235, 160, 0.6) 40%, transparent);
}

So to remove the background entirely, you can use
a:hover, a:focus, a:active { background-image: none }
Or to make it still contrast with the red color, but not move, you can use
a:hover, a:focus, a:active { background-image: radial-gradient(circle, rgba(245, 245,160,0.9) 50%, transparent); }
or whatever you prefer.

Your site seems a bit odd, since it says it is using the latest version of the theme, but it is trying to load the skip-link-focus-fix.js file, which was removed from the theme last July. I wonder if you have a cache or a child theme that is loading that?

I must admit that I thought you weren’t even using my theme when I first saw the site. I guess with Elementor, you can make it look like anything.

Hi, thx it worked.

“I must admit that I thought you weren’t even using my theme when I first saw the site. I guess with Elementor, you can make it look like anything.”

Thats because iam an amateur with wordpress (like 6-8 months) and i changed much elements on the site too often?
With elementor is correct.

You think i should build the site from zero again?

No, whatever you want to do is fine, but usually you can see the look of the theme somewhat. With Elementor, you don’t.
It seemed like there was only one page. And I clicked that thing at the top that seemed to indicate English (in the status bar), but it didn’t really change anything. (I was trying to find a link, but there aren’t very many.) So I can’t really tell what your site is about or if you should rebuild it.
What I’ve learned about web pages is that each page should be focused on “What do I want the user to do(or know or learn) on this page?” If there are too many things in one page, the user just leaves.

thx for the input!