Vertical centering button to match adjacent column
I have two columns in this snippet below of my email template. Left - text of variable length. Right - fixed button.
I need the columns to responsively wrap on mobile, so they should be seperate. So right column doesn't know height of left. How can I get it center vertically to match no matter height of left column?
valign="middle" has not worked unless I set a fixed height.
Thanks for any help