I have been trying for hours to add a color scale to my vector layer in order to avoid showing all those boxes in my legend.
But I don't find any solution. I tried the Geoproc plugin without success, it only works with rasters and my layer is a vector. I also tried generating .qml files but the Geoproc plugin did not accept them.
Does anyone have an idea?
I would like a color scale like this but in red:

