Imagine you're sitting in front of a table. Wobbly IKEA table, fine hand-made wooden desk, I don't mind.
On the table is a scrap of paper.
On the paper is some handwriting, in black ink (specifically, Uniball Eye Fine UB-157 pigment-based black ink). It looks like this:
Switch to dark mode
You yell 'Switch to dark mode!'
There is a shuffling in the distance.
After a short while, somebody wanders in with a black piece of paper with the same words written in white pen.
They flip the lights off on their way out of the room, making it a little tricky to read.
Switch back to light mode
You yell 'Switch back!'.
There is a shuffling again. The same somebody pops their head round the door, dimly silhouetted in the dark.
"No."
They leave.
It is dark. You are likely to be eaten by a grue.