CSS CODE

Hello,
First of all I would like to thank you for your great support service.

Now, I would like to insert the following changes into my main menu, and I would like to know the CSS code:
– I would like to insert rounded corners just in the first and last item.
– I would like to delete the white line between the different elements in the menu.
– I want to center the whole menu, now its aligned to the left.
– I would like to know how to include icons in each menu box
– And the last thing, I would like to know how to insert a shadow in the menu box.

Kind regards
Amparo