Help with building a block with a button

@davemanson - I tried to replicate what you’re trying to do, and I’ll admit it’s a bit hacky.  What I did was insert a “3 Column” Section and put the Button Block in the middle, and two empty Text Blocks on either side (and made sure it only showed on Desktop view because columns stacks on Mobile). 

Then by adjusting the two Text Blocks’ inline Background color, and fiddling with the margins, it sort of works.

You can see that here:

However, as soon as you switch to Mobile, you will have the same problem unless you can represent it differently on mobile without the gutter.  So this may not be fool proof either!  

Another approach may be simply to insert a Table Block and build your own Button in HTML.  It’s definitely not as elegant or simple as the native Button Block.  Let us know how it works out!