If you spin up a new WordPress site using the Bitnami installer on Google Compute Engine, then you will see the bitnami banner in the bottom right.
The banner links to useful information about your Bitnami install which could be a security issue. I have seen people try to hide it using CSS, DO NOT use CSS to hide the banner. The code for the banner will still visible.
The correct way to remove the Bitnami banner is to run the following commands. SSH into your VM and run:
Disable Bitnami Banner
Restart Bitnami Apache
You should always restart the Bitnami Apache server to make sure all changes take affect.