infopopup width

I tried to make a pop up on one of my posts on my web site using the infopopup plugin.

this is the page: https://strafferammen.dk/dom-i-sagen-fra-strandby-plads-i-esbjerg/

The pop up is called: Strafferammen for Grov vold

(just above the poll)

i tried to follow the instruction on how to fix this problem on this page:

https://www.ads-software.com/support/topic/adjusting-size-of-popup-box?replies=6

however this seems to work on mobile devices, it does not effect the width of the popup when viewing it on my pc.

does anybody have a trick so i can set the width to the same value as the width of the post. so it does not block for my menu and ads:)

A huge thank you for any help!!!:)