ruby on rails - What is causing this shift in layout? CSS? -

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i have been following ror tutorial , noticed layout appears shift while moving between nav links. rather link actual project, can see talking looking @ author's personal homepage: www.michaelhartl.com/ if move between nav links @ top, whole page appears shift. guessing has nothing ror, , more css.

some pages have scrollbars, others don't. when scrollbar appears shift left pixels. (if mean.)


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