Or Shift + G to completly disable CSS. You can of course create shortcuts for any of those styles in Page -> Style: Select user CSS file, # | Deselect user

Or Shift + G to completly disable CSS. You can of course create shortcuts for any of those styles in Page -> Style: Select user CSS file, # | Deselect user CSS file, # where # is a number of a style in styles/user/ (ls -U, starting from zero).