If you're one of those who prefers BHW with the white background, but don't know how to change it, read up. In order to do this, simply click on your username from the top right section (next to inbox & alerts). From the drop-down menu, select "Preferences". Now you can select WhiteVersion from style options. Edit: Apparently you can still change the styling from the bottom left, just click on the "BlackHatWorld-2015-BlackVersion" & select the White Version.