Add a drop shadow to the navbar

[YoshithaRathnayake]

Is your feature request related to a problem? Please describe.
Currently, we can't see the difference between the navbar and the home page.

Describe the solution you'd like
So add a drop shadow to the navbar

Screenshots
Before

After the change

Are you working on this
Yes

[YoshithaRathnayake]

@anjula-sack shall I work on this? Is this okay?

[mayura-andrew]

@YoshithaRathnayake Yeah, you can 🚀

[YoshithaRathnayake]

@YoshithaRathnayake Yeah, you can 🚀

can u assign me? @mayura-andrew

[Michila0]

what is the update?