Button to move an element for several times

Hi. How can I make a button that will move a div block for, for example, 200px by the first click, for 400px by the second click, for 600px by the third click and so on.
I have a section on my website where I putted feedback comments by the clients and on screen only 2 of the can be shown. So I want a button, that will slide this divblock with comments by a strict amount of pixels every time I press it.
How can I make it?

Here is my public share link: LINK
(how to access public share link)