[FEAT] background colour pallette ui enhancement

[Harshitazz]

Is your feature request related to a problem? Please describe.
better ui and appealing

Describe the solution you'd like
make the pallete in a grid of two columns and giving more colour option by adding built in colour pallete (just like pen colour pallette)

@singodiyashubham87 assign it to me

[riteshjha61253]

@singodiyashubham87 Can you Assign this issue to me so that I can start working on that.

[singodiyashubham87]

@Harshitazz There is already an issue regarding this. #61