Change the text color when selected on Navbar

[IbraheemHaseeb7]

The color of the selected buttons should be white instead of what it is right now (black).

This will enhance the design and make it better

[IbraheemHaseeb7]

I have submitted my Pull Request which fixes this issue. Can be checked at #280

[AnshuWorld]

Please assign me this work

[Shreeteja-N]

please assign this for me,i want to work on it