diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 775c2aeed2..4e28c43e7f 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -1804,6 +1804,8 @@ 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"));
 
     m_slice_btn = new SideButton(slice_panel, _L("Slice plate"), "");
     m_slice_option_btn = new SideButton(slice_panel, "", "sidebutton_dropdown", 0, 14);