Board Thread:Support Requests - Designing Your Wikia/@comment-26159565-20151225231222/@comment-4018164-20151226114222

So try something like this: The value of the  property is just to make the infoboxes "stick together", rather than having a gap. You can completely remove it, or play with it, but if you want the infoboxes to be exactly next to each other, this is how you can calculate the formula:
 * $$d = -1 * (m_{left} + m_{right})$$

Where:
 * mleft is the left margin of the infobox (of the right infobox, if using 2 different infoboxes)
 * mright is the right margin of the infobox (of the left infobox, if using 2 different infoboxes)
 * d is the value of the  property for the   element