I’m attempting to create scatter plots of some strange attractors in Julia using GLMakie. I could not find a way of setting the entire background (everything except the points) black. Here is part of my code:

fig = Figure(size=(1500, 1500), backgroundcolor = RGBAf(0, 0, 0, 1))
fig_grid = CartesianIndices((1, 1))
cmap = to_colormap(:BuPu_9)
cmap[1] = RGBAf(1, 1, 1, 1) 

let
    n_points = 10^6
    for (i, arg) in enumerate(cargs)
        global points = trajectory(Juan, arg...; n=n_points)
        r, c = Tuple(fig_grid[i])
        ax, plot = datashader(fig[r, c], points;
            colormap=cmap,
            async=false,
            axis=(; type=Axis, title=join(string.(arg), ", ")))

        ax.backgroundcolor = RGBAf(0, 0, 0, 1)
        plot.backgroundcolor = RGBAf(0, 0, 0, 1)
        hidedecorations!(ax)
        hidespines!(ax)
    end
end
rowgap!(fig.layout,5)
colgap!(fig.layout,1)
display(fig)

I tried setting the figure background color black and the axis background color black, yet when displayed, only the border of the image has a black background color. Sorry for such a simple question, as I am new to the language. Thanks in advance!