diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 53a7fcb614..6f8de35094 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -1790,8 +1790,8 @@ wxBoxSizer* MainFrame::create_side_tools()
 
     auto slice_panel = new wxPanel(this,wxID_ANY,wxDefaultPosition,wxDefaultSize);
     auto print_panel = new wxPanel(this,wxID_ANY,wxDefaultPosition,wxDefaultSize);
-    slice_panel->SetBackgroundColour(wxColour("#3B4446"));
-    print_panel->SetBackgroundColour(wxColour("#3B4446"));
+    slice_panel->SetBackgroundColour(StateColor::darkModeColorFor(wxColour("#3B4446")));
+    print_panel->SetBackgroundColour(StateColor::darkModeColorFor(wxColour("#3B4446")));
 
     m_slice_btn = new SideButton(slice_panel, _L("Slice plate"), "");
     m_slice_option_btn = new SideButton(slice_panel, "", "sidebutton_dropdown", 0, 14);
@@ -2324,6 +2324,11 @@ void MainFrame::update_side_button_style()
     m_print_option_btn->SetExtraSize(wxSize(FromDIP(10), FromDIP(10)));
     m_print_option_btn->SetIconOffset(FromDIP(2));
     m_print_option_btn->SetMinSize(wxSize(FromDIP(24), FromDIP(24)));
+
+    // Keep panel backgrounds in sync with SideButton's darkModeColorFor(#3B4446) bottom strip
+    auto bg = StateColor::darkModeColorFor(wxColour("#3B4446"));
+    m_slice_btn->GetParent()->SetBackgroundColour(bg);
+    m_print_btn->GetParent()->SetBackgroundColour(bg);
 }
 
 void MainFrame::update_slice_print_status(SlicePrintEventType event, bool can_slice, bool can_print)