reorder country list in cart and checkout for Österreich

Hi,

those problem for shop owners in Austria was bespoken some times here:
If you use the dropdown for the countries the entry Österreich is always at the end of the list and I could not found any solution to group the countries somehow, that the most important are on the top (i.e. Österreich, Deutschland first and then the rest)
But what I have found now is a new css display property named flex
w3schools…flex
I tried to use it in my custom.css and it worked somehow to at least reverse the listing so Österreich comes first and Zypern next 😐 (I’ll ship to EU-Countries only).
But the list items are not with each other vertically (untereinander) from top to down, they are side by side (horizontally, nebeneinander) now.
May someone has better knowledge in css to get them displayed nicer?
Or does anyone has a hack (filter, hook…) to achieve a grouping like mentioned above?

Thanks
Tom

https://wordpress.org/plugins/woocommerce-de/