#content{ background-color: #fff; ...
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Mainly : Log to WP -> Spaceship theme-> Appearance-> Main appearance settings -> Custom background color
With regards.
Everything is in documentation :-) http://apollo13.eu/docs/spaceship/#!/installation_update_after_installation
About background color of content you will have to edit CSS for it. If you wish to do it then remember http://apollo13.eu/docs/spaceship/#compressed_options
Then you can edit file wp-content/themes/spaceship/style.css line ~294 and change it to desired value.
With regards.