Aside from my extension template (Thanks @Fabian for linking it), which in my biased opinion is the best way to add branding to the login screen, I have included a link to my repos wiki that links to posts describing how this is done.
https://github.com/Zer0CoolX/guacamole-customize-loginscreen-extension/wiki/Helpful-Resources As I explain in the readme for my extension template, doing this via an extension has many benefits. Hope this helps. -- Sent from: http://apache-guacamole-general-user-mailing-list.2363388.n4.nabble.com/
