Weird transparency thin-line

[etcbbu]

Hi all,

Got a new page I'm building here

https://ktravisj.com/bynum/index.php

And here's my .WBS project-file:

https://ktravisj.com/bynum/proj.zip

(Can you post here to let me know when you've snagged it so I can take it down?)

Notice when you load the https://ktravisj.com/bynum/index.php page on a mobile smartphone / 320-pixel width sized window, if you scroll to the element on the page that's the WMWD Hover Boxes animated-boxes that are "Residential" and "Commercial"; two weird lines of transparency is showing [looks like maybe a 1-pixel height..?]. I've tried to chase down several different types of borders/paddings/insets/outsets with this object for other graphic reasons lately; and I'm frazzled. Why is this little line of transparency showing, and how can I get rid of it? I'd like to color it black, so it matches the rest of the box and doesn't show, or whatever. Dunno which property/setting/or whatnot will work, that I can edit/adjust.

[Pablo]

I cannot load the project because it uses a third party extension, which I do not have.
But it looks like the lines are the background of the first and last grid column.

[etcbbu]

Thank ya, @Pablo ; got it fixed!
WYSIWYG Web Builder is THE BEST