Hello! I adore this theme, it looks great! Would there happen to be a import for the demo content so I have a jumping point? I’d greatly appreciate it!

I imported my Tumblr blog to WordPress for backup. All my posts are mostly series of pictures. WordPress imported them as Classic image galleries, and the default view is a 3 column grid. Is there any way to force all galleries to 1 column grids? CSS maybe? My CSS foo is not strong, so I haven’t a clue if this is even possible. Ideally I’d like a way to update all the posts automatically or in bulk. There are way too many to touch them all by hand.