I’ve been trying to change plot themes in Material template. With DarkTheme this is possible as it somehow changes the original Bokeh properies (see in topic name).
Of course, I would like to use different colors. I tried to change CSS properties for all classes that I could find to no prevail.
Template like the MaterialTemplate provide a custom bokeh theme. You will need to override/ update that theme or provide a custom theme for the HoloViews pane.