Default phpMyAdmin Login Credentials
Here's what I did


Open phpmyadmin directory
You will see config.sample.inc php file
Clone it, but remove the sample from the title
After cloning, open the file config.inc and look for $cfg['Servers'][$i]['AllowNoPassword'] = false;
Set it to true


By doing this, we are allowing the phpMyAdmin to submit an empty password.

Now, try root as a username and leave the password blank.

Hope this will work for you as well.