Sub menu font colours won't work

I am not sure what I am doing wrong but it used to work. When I go into my sub menu to change the font colours nothing changes. I have reset all back to defaults but when I save and publish nothing happens. On my site the submenu is not showing unless the item is hovered over. The font is supposed to be black on a white background but is appearing blue when hovered over and when not hovered over the font and the background are both white. In the customize menu I have changed the background colour to a blue shade with black font colour and it shows perfectly in the customize menu but will not show up on my site. So I went back to all the defaults in the theme and it still doesn’t work properly. I have the Let’s Blog theme. I have no idea how to code or get this to work.

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