What I am typing now is black text on a white background. If you hold down your left mouse and colour in the typing it turns into white text on a blue background.
If you change the text colour from black to white then you get what looks to be empty space (white text on a white background) and when you swipe the mouse over it again it all looks white text on blue background meaning you can see it all.
In the last one I typed (post 143) I changed every second letter to white - if you colour it all in you will see the message I wrote - if you swipe the mouse (ie left click and hold while you move the cursor) on the messages from Ironmonger and TheBrownDog you will also be able to read those ones...
Helpful or still brain hurty?
Brain hurty!
...but appreciate your efforts to explain it to me, thanks