If You Install Your Ghost Cms Blog Help Of Bitnami.By Default Bitnami Add Corner Banner Logo On Your Website.
There are 3 steps:
- Access your Ghost instance
- Enter command to disable banner
- Restart NGINX
Access your Ghost instance:

- Open Your Google Console Dashboard.

- Open Your Google Console Dashboard Then Click Top Left Conner humbar Icon.Click Compute Engine, Select VM Instance Then Your VM Instance Page Open.

- After Open Instance page.Click SSH Button.

- After Open Your Instance Page. Then Click SSH Button. Some You See Open New Window In button Side you See Your SSH terminal Successfully Open.
Enter command to disable banner && Restart NGINX:
First Command:
sudo /opt/bitnami/apps/ghost/bnconfig --disable_banner 1
Second Command:
sudo /opt/bitnami/ctlscript.sh restart nginx

Conclusion:
If You Follow My article.You Definite Remove Bitnami Corner Banner Logo From Ghost CMS. If you have Any Problem or Error Contact Me. I try to help and solve your Problem