Bar chart has default CSS rules with padding

Hello.
I am implementing mashup for a client and he wants to display on screen various bar charts, similar to those  you see in the picture. I used Themable  Bar Chart in Thingworx 9.3
I used collection widget, each collection cell has only has this single chart widget.
The problem is that client screen has small resolution and I can not allow to widget to have 32px padding. (see picture)
Is there a way to remove/modify this two CSS rule (:host{} and [part~="chart-layout"])  from Shadow DOM?
Thank you.
Illya.