How to stop Google+ Sign-In Button from popping up the message “Welcome back, you've already connected with this app via Google+ Sign-In as …”

Question

I\'m adding Google+ sign in button to my site using the server-side flow. Here is how I render the sign in button:

Answer 1

The accepted answer is the right way to do it, but if for some other reason you just want to hide the generated iframe, you can do it with CSS:

iframe[src^="https://apis.google.com"] {
  display: none;
}