Ok, create a gtk.css file if you do not have one already in ~/.config/gtk-3.0/
Paste this into it and save the file:
.nemo-window rubberband, .nemo-window flowbox rubberband, .nemo-window treeview.view rubberband, .nemo-window .content-view rubberband, .nemo-window .rubberband, .thunar rubberband, .thunar .rubberband, .content-view.view.rubberband, .view.rubberband, flowbox rubberband, rubberband, .rubberband, rubberband, XfdesktopIconView.view .rubberband, .content-view rubberband, .content-view .rubberband, treeview.view rubberband {
background-color: rgba(0, 195, 255, 0.3);
border: 1px solid #000;
}
Log out, then in and test...


