How to customize email actionable template in SharePoint Online?

Hi,

I’m using Nintex workflow in SharePoint Online, where I’m creating a task and sending email actionable. Here I would like to know following two things:

1. Can I replace top default NINTEX logo with my custom logo? If yes, then where can I do it.
2. Is it possible to hide/remove ‘View in SharePoint’ button at bottom.

Any help would be appreciable.