Log-in button not working?

So I went into minecraft.net to change my username. Everything was going fine until I got to the login screen.

At which point, but log-in button does absolutely nothing when i click it.

Now, originally I thought that this was because my password was old and outdated. To a degree, yes. My previous password had no special characters inside. So I reset the password, added a special symbol at the end, a*nd attempted to log in again*. And, yet again, the log-in button does absolutely nothing at all. No error messages, no time-out messages, nothing.

I'm genuinely confused as to why this is happening. And to be clear, nothing on it said anything about any info being wrong. Thanks