How to edit the upfront Account page layout?

Im currently using the Upfront Spirit theme. The account page is generated using two shortcodes. which creates a slight issue that i cant edit the layout directly with the upfront theme? Currently the Username & Password fields are offset at two different locations. How can they be aligned one on top of the other and centred in the page?

Screenshot public view - + (changes to make)
Screenshot of page edit view -
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