To start you should be aware that there is no such property as
float:center and there is now no element called
Also, when you refer to ‘centered’, I assume you mean centered in the bar and not in the middle of the screen…right?
I have to say that you have a lot of repeated CSS that could be extracted out to classes and the HTML structure seems to be overcomplicated.
A standard nav/ul structure might be better for you….I’ll have a think.