Use this snippet to remove the overlay for all rows:
.panel-grid .row-overlay { display: none; }
To remove the overlay just for a specific row, use and adapt this snippet:
#pg-8-5 .row-overlay { display: none; }
Tip: In the code above replace 8 with your page ID and 5 with the position of your row (note: numbering starts from 0 – so if you want to remove the overlay for the third row you’ll add 2)
INFO: This is a CSS snippet. If you don’t have a child theme or don’t know how to use one, we recommend that you add this snippet in Customize > Additional CSS.