Sure, you can add a custom class to your Row, then modify the background properties of that row for mobile with a media query.
Give us your URL if you want further help.

Here is the URL of the problem page:

http://nerddevelopment.com/rightnerd/website-design-samples/

Thanks in advance for your help!

Paul

So you can see your VC generated class for your row is “vc_custom_1494626291717″ (you can see that with DEV TOOLS), then add this media query to your Custom page CSS in order to override the default top 200 and bottom 500 you have set:

@media only screen and (max-width: 768px) {
.vc_custom_1494626291717 {
    padding-top: 120px !important;
    padding-bottom: 120px !important;
}
}

Then to override the background position FIXED you have set for the background you can add this:

@media only screen and (max-width: 768px) {
.vc_custom_1494626291717 .upb_row_bg {
    background-attachment: inherit !important;
}
}

Paul