Ability to set width (or wider by default)

The slider is very narrow here. Not to mention that the default blue color is completely invisible with dark theme, even after I set a bright color it's barely visible, not to mention very hard to click. The following screenshot shows it (to the right), against a few other plugins, notably xfce4-systemload-plugin in the middle, and xfce4-cpugraph plugin to the left, both featuring much wider bars. This is on 2160p, so the slider is < 1 mm wide.

Could you either provide an option to set its width, or at least make it a little wider by default?