After some investigation, I discovered that in the current CSS implementation in GTK is not possible to add a text-shadow with blur (the shadow is not rendered), so we are forced to stick with the current 1px shadow in the desktop until GTK gets compatible with blurred text-shadows.
After some investigation, I discovered that in the current CSS implementation in GTK is not possible to add a text-shadow with blur (the shadow is not rendered), so we are forced to stick with the current 1px shadow in the desktop until GTK gets compatible with blurred text-shadows.