Is there a way to edit the callout banners?

the callout banners are looking very plain, I need to make them a bit more flashy, please help as to how this can be achieved.

Namaste @Nidhi_Pawar
What do mean by “bit more flash”? What’s the use case? What do you want to customise?

enhance the appearance, make them standout a bit more, maybe the borders could be a little bold or the bg color can be changed