Fixed Y position, fill X component

Hello,
I’m trying to  build a repsonsive barchart with bars and a XY axis labels like this:
 

To make the bars overlap the graph labels and dotted lines I have the bars as a fixed position.

What I cant do is make this responsive. When stretched the fixed postion bars do not respond to the new width. So it looks like this:

 

Is there a way to have the Y value of the bars fixed but have the width fill?