Wow! To be 15 again and be able to carry hundreds of books in the palm of my hand.
About the color. When I get engrossed in the book, I can't tell you if it is day or night
But, like you, I prefer black.
Many folks have mentioned all the free books you can get. That makes it like sitting in a library and scanning through the stacks. Start reading; don't like it? Put it back and find something you do like. I bet you'll find some eye opening gems along the journey.
Enjoy reading; one of mankind's greatest gifts!
Ralph