Hi,

I'm creating a stacked column chart, and having a problem.

Instead height of chart equal to height of maximum column as picture:

https://gyazo.com/6d28040a8c4fb4bac3ea18e0cd22d2a0

I want to height of chart greater than height of maximum column (ex: 20px) 

And maximum value of vertical axis greater than value of maximum column too.

(Now value of vertical axis is 35, value of column is 39)

How to do that?

Thanks in advance.