I use Firefox browser and on my browser screens there is no "box" or boundary around where you need to type (except this message dialogue for the body text area, it has a pale grey boundary), thus i can not see where I am supposed to put my user name or password when trying to log on.
It is also the same difficulty to see where I am supposed to enter new post title on this page... its just a white space on a white background... anyone's guess really!
I am using Firefox 43.0.1 with Windows 10.
Sorry for negative post, i'll be sure to say something positive soon!