Is there any ways to change the font color and background of the working directory as seen in Sublime text?
Neovim with NERDTree
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From their issue #858:
The colors are not configurable NERDTree settings. [...] Try using a different colorscheme. If you don't like any of the default colorschemes, you can always download others as additional plugins.
So you might not be able to do what you want.
Edit Actually the directories has the highlighting group
NERDTreeCWD so you could try to change the value of this group. For example something like this might work (I didn't test it):
highlight NERDTreeCWD ctermfg=white