The default template for posts and pages aligns the page beautifully in the middle. But you can customize posts/pages easily via switches in the front matter to get a sidebar and/or to turn off meta-information at the end of the page like categories, tags and dates.
Feeling Responsive shows metadata by default. The default behaviour can be changed via config.yml. To show metadata at the end of a page/post just add the following to front matter:
show_meta: true
If you don’t want to show metadata, it’s simple again:
