If you are talking about bootstrap files i downloaded them and i don't think that i should modify them.

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> On Apr 13, 2014, at 3:21 PM, Khaled Helmy <notifications@github.com> wrote:
> 
> In tutor/app/assets/stylesheets/application.css:
> 
> > @@ -11,3 +11,31 @@
> >   *= require_self
> >   *= require_tree .
> >   */
> > +
> > +.center{
> Please leave a space between the style property and the opening curly brace. The same issue is present in the rest of properties.
> 
> —
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