I have tried every code listed here to remove the white border around my page and NOTHING works. I must be doing something wrong or they changed something. I don't know. I have a Plus account and am using the Bookworm Mixit layout. I've removed the code from my custom css since it hasn't worked, but any enlightment anyone can give is hugely appreciated!
I love this site. I've been able to change different things about my header and background using the code you've given us here, but the white border has me stumped. It looks really horrible against my black background.