Having issues with nav menu on PC and mobile.

I recently removed an arrow from my website’s nav menu. However, it’s left my an uneven space between the pages. I was given this custom CSS code to remove it:

/* eliminate dropdown arrow */
.elementor-navigation .menu-item-has-children > a:after {
display:none;
}

Additionally, I’m not sure how to make this code work on tablet/ mobile devices because the arrow still shows up.

I am using the Ocean WP theme alongside the elementor plugin. Could anyone offer me any guidance or help? I would greatly appreciate it because I’ve spent all day researching answers.

The page I need help with: [log in to see the link]