How to center narrow vertical spacer block

Site URL: http://www.friendsofrecoveryneo.com

I added a vertical spacer between 2 columns, but when I resize the vertical spacer block to the narrowest size it will allow (it will only resize in increments), I am not able to center it.

Current state:  columns are equal width but there is too much space between columns.

If I make the spacer block narrower, I am not able to center it so the columns are not equal width:

So, how can I. . .

1.  Resize the width of the block to a custom size (override the forced increments).

and

2.  Center the spacer block so the columns on either size are the same width.

Thanks!

The layout has a 12 column grid, so if you add a 2-column spacer you'll have two 5-column text blocks (your first image). If you change the spacer to 1-column, there are 11-columns remaining so it isn't possible to have equal text block widths.

The only way around this is to manually set the column widths with CSS on this page, but this will have implications for the rest of the page content, and so isn't recommended.

Bummer.  Is it possible to at least change the width of the spacer?  Or is there another way I should be doing this?  Seems like this would be a basic design need.