Parallax settings ?

Ive installed a parallax block in my pagebuilder .. and can’t seem to be able to control the height of the image to be displayed.

You can view it here : http://xfclan.com/our-team/administrators/

I figured out that i can comment out line 2576 of main.css to partially achieve my goal but i’d like a more “permanent” solution that won’t be reset every time the template is updated.

I tried incorporating the code into my child theme style.css file .. but it didn’t work.

My questions are :

1 – How can i add the code to my child theme style.css file ? So that the image area being displayed is higher.

2- Is there a way to have the css automatically resize the image so that it fits entirely in the parallax block ? Currently it’s only taking part of the image.

Thank you.