Thanks. That really helped. I almost got it done. I managed to change the color of the background of the template from blue to red, but the title, header, and navigation won't do the same despite the fact that I'm copying the code and adding in "Series2"
Original series
.portable-infobox .pi-title,
.portable-infobox .pi-header,
.portable-infobox .pi-navigation {
background-color: #002041;
}
Spin off
.portable-infobox-theme-Series2 .pi-title,
.portable-infobox-theme-Series2 .pi-header,
.portable-infobox-theme-Series2 .pi-navigation {
background-color: #410000;
}