Sorry for the late response, I wanted to make sure I tested and proved this locally before providing further details. – A positive response for you anyhow:
The Video Row: Add a custom class, ex: btm-slant-fix
Please add this to Theme Options => Custom CSS:
.btm-slant-fix.spb-row[data-bottom-style="slant-rtl"]:after {
background-color: red !important;
}
The Row Below The Video Row: Get the background color set for this Row and replace the color value in the above CSS with this Row background color.
That should sort it for you.
Thanks,
David.