diff --git a/panel/template/fast/theme.py b/panel/template/fast/theme.py
index 8b6f6de9a9..775a0f23bf 100644
--- a/panel/template/fast/theme.py
+++ b/panel/template/fast/theme.py
@@ -100,6 +100,7 @@ def create_bokeh_theme(self):
                     "background_fill_color": self.neutral_fill_card_rest,
                 },
                 "ColorBar": {
+                    "background_fill_color": self.background_color,
                     "title_text_color": self.neutral_foreground_rest,
                     "title_text_font": self.font,
                     "title_text_font_size": "1.025em",
@@ -107,7 +108,6 @@ def create_bokeh_theme(self):
                     "major_label_text_color": self.neutral_foreground_rest,
                     "major_label_text_font": self.font,
                     "major_label_text_font_size": "1.025em",
-                    # "background_fill_color": FAST_DARK_75,
                     "major_tick_line_alpha": 0,
                     "bar_line_alpha": 0,
                 },