Navigation doesn't work properly in Internet Explorer

Hello!

I’m working on this website: https://www.ongewoonalieke.nl

In Firefox, Safari & Chrome the website works fine, but in Internet Explorer it doesn’t work properly . The top menu is not displayed correctly. The text is higher and there appears a white border on the bar.

Does anyone have a solution to this problem?

This is the CSS for the navigation:

[CSS moderated as per the Forum Rules. Please just post a link to your site.]