Reusable CSS

Hi All,

I must be missing something simple, but I want to have all my elements to be white. Testing this on these Nav Links, I can change the color if I change each Nav Link to #fff

if I add

a.nav-item.nav-link {color:#fff
}

to the style sheet nothing changes. When I check the ‘Styles’ tab on the right, I notice the style has a strike through:

I don’t want to have to change each element’s color. Please help.

Thanks