diff --git a/keymap_drawer.config.yaml b/keymap_drawer.config.yaml
index ac7c8fe..6a409b5 100644
--- a/keymap_drawer.config.yaml
+++ b/keymap_drawer.config.yaml
@@ -4,3 +4,4 @@ parse_config:
 draw_config:
   separate_combo_diagrams: true
   combo_diagrams_scale: 3
+  svg_extra_style: "rect.combo-separate { fill: #000000; }"