[Theme: Onetone] : Navigation issues

Hi,

I just created my very first website and am having two issues with the site navigation:

1. Site navigation (hover over colour) : I would like to change the hover over colour navigation. It is currently brown. I tried to add the following to the code but with no result:
.home-navigation li a:hover {
color: #fff;
}

2. Site Navigation: When clicking on the different sections in the site navigation I get directed to the right sections on the page. However the hover over colour in the navigation is on the wrong section. E.g. I clicked on ‘Sevices’, I get directed to Services, but the colour in the navigation is an an other item.

I hope this all makes sense! Many thanks in advance!!!