Increasing space when using Full Width page type

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Hi, I'm a beginner to using C5 so I apologize if I have trouble conveying my issue.

I'm creating a page using the Full Width page type with C5's default theme, however I would like to expand the amount of editable space the template allows. For example it seems the pages have a buffer on the left and right side and it leaves me with less than optimal space for the content centred in the middle.

Is there a way to increase the size of my content block, or decrease the size of the padding around my content block (to the left and right side)?