Long virus warning with no buttons?

I had clicked on a website that had been used on my phone before (this time on my computer) and it suddenly opened a tab that read something similar to, "MAJOR VIRUS WARNING". It literally scared the life out of me and a really long pop-up came up that had a number on it and said (TOLL-FREE) after it. However, the long "virus warning" looked real and it had no buttons to say "ok" or to cancel. It even took me about ten minutes of trial and error (the computer often telling me that it was unable to shut down because of the webpage) and I am just really scared. I have heard a LOT about pop-up scams and I am wondering if this is one of them.

Thank you~