background for boxed layout can be changed under Theme options > Colors > General section. About posts we are not sure how you did them. Do you display posts by default instead of homepage? If this is how you display posts, you can change their amount under Settings > Reading section.
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background for boxed layout can be changed under Theme options > Colors > General section. About posts we are not sure how you did them. Do you display posts by default instead of homepage? If this is how you display posts, you can change their amount under Settings > Reading section.