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New development to add a third column to the arthemia theme. Beware that some region names have been changed, so updating may require you to move the blocks to their correct regions again (however, so far they should fall into the correct region automatically).
This is still a work in progress and dimensions, padding and margins etc may all change with little notice.
If you think this theme requires anything or can think of something that will make this theme better, please go ahead and open a new issue for it.