diff --git a/src/slic3r/GUI/Widgets/ComboBox.cpp b/src/slic3r/GUI/Widgets/ComboBox.cpp
index f0e885ccb4..c45cd41065 100644
--- a/src/slic3r/GUI/Widgets/ComboBox.cpp
+++ b/src/slic3r/GUI/Widgets/ComboBox.cpp
@@ -131,7 +131,14 @@ bool ComboBox::SetBackgroundColour(const wxColour& colour)
     TextInput::SetBackgroundColour(colour);
 
     drop.SetBackgroundColour(colour);
-    drop.SetSelectorBackgroundColor(background_color);
+    StateColor selector_colors( std::make_pair(clr_background_focused,          (int)StateColor::Checked),
+        Slic3r::GUI::wxGetApp().dark_mode() ?
+                                std::make_pair(clr_background_disabled_dark,    (int)StateColor::Disabled) :
+                                std::make_pair(clr_background_disabled_light,   (int)StateColor::Disabled),
+        Slic3r::GUI::wxGetApp().dark_mode() ?
+                                std::make_pair(clr_background_normal_dark,      (int)StateColor::Normal) :
+                                std::make_pair(clr_background_normal_light,     (int)StateColor::Normal));
+    drop.SetSelectorBackgroundColor(selector_colors);
 
     return true;
 }
@@ -286,8 +293,6 @@ void ComboBox::keyDown(wxKeyEvent& event)
     switch (key_code) {
 #ifndef __WXOSX__
         case WXK_RETURN:
-#endif
-        case WXK_SPACE:
             if (drop_down) {
                 drop.DismissAndNotify();
             } else if (drop.HasDismissLongTime()) {
@@ -298,6 +303,7 @@ void ComboBox::keyDown(wxKeyEvent& event)
                 GetEventHandler()->ProcessEvent(e);
             }
             break;
+#endif
         case WXK_UP:
         case WXK_DOWN:
         case WXK_LEFT:
diff --git a/src/slic3r/GUI/Widgets/DropDown.cpp b/src/slic3r/GUI/Widgets/DropDown.cpp
index 259ed11e63..4aac437458 100644
--- a/src/slic3r/GUI/Widgets/DropDown.cpp
+++ b/src/slic3r/GUI/Widgets/DropDown.cpp
@@ -211,6 +211,10 @@ void DropDown::SetTransparentBG(wxDC& dc, wxWindow* win)
 #endif //__WXMSW__
 }
 
+constexpr int slider_width  = 12;
+constexpr int slider_step   = 5;
+constexpr int items_padding = 2;
+
 /*
  * Here we do the actual rendering. I put it in a separate
  * method so that it can work no matter what type of DC
@@ -243,11 +247,17 @@ void DropDown::render(wxDC &dc)
 
     // draw hover rectangle
     wxRect rcContent = {{0, offset.y}, rowSize};
+    const int text_size = int(texts.size());
+
+    const bool has_bar = rowSize.y * text_size > size.y;
+    if (has_bar)
+        rcContent.width -= slider_width;
+
     if (hover_item >= 0 && (states & StateColor::Hovered)) {
         rcContent.y += rowSize.y * hover_item;
         if (rcContent.GetBottom() > 0 && rcContent.y < size.y) {
             if (selection == hover_item)
-                dc.SetBrush(wxBrush(selector_background_color.colorForStates(states | StateColor::Checked)));
+                dc.SetBrush(wxBrush(selector_background_color.colorForStates(StateColor::Disabled)));
             dc.SetPen(wxPen(selector_border_color.colorForStates(states)));
             rcContent.Deflate(4, 1);
             dc.DrawRectangle(rcContent);
@@ -259,7 +269,7 @@ void DropDown::render(wxDC &dc)
     if (selection >= 0 && (selection != hover_item || (states & StateColor::Hovered) == 0)) {
         rcContent.y += rowSize.y * selection;
         if (rcContent.GetBottom() > 0 && rcContent.y < size.y) {
-            dc.SetBrush(wxBrush(selector_background_color.colorForStates(states | StateColor::Checked)));
+            dc.SetBrush(wxBrush(selector_background_color.colorForStates(StateColor::Disabled)));
             dc.SetPen(wxPen(selector_background_color.colorForStates(states)));
             rcContent.Deflate(4, 1);
             dc.DrawRectangle(rcContent);
@@ -274,15 +284,13 @@ void DropDown::render(wxDC &dc)
     }
 
     // draw position bar
-    const int text_size = int(texts.size());
-    if (rowSize.y * text_size > size.y) {
+    if (has_bar) {
         int    height = rowSize.y * text_size;
-        wxRect rect = {size.x - 6, -offset.y * size.y / height, 4,
-                       size.y * size.y / height};
+        wxRect rect = {size.x - slider_width - 2, -offset.y * size.y / height + 2, slider_width,
+                       size.y * size.y / height - 3};
         dc.SetPen(wxPen(border_color.defaultColor()));
-        dc.SetBrush(wxBrush(*wxLIGHT_GREY));
+        dc.SetBrush(wxBrush(selector_background_color.colorForStates(states | StateColor::Checked)));
         dc.DrawRoundedRectangle(rect, 2);
-        rcContent.width -= 6;
     }
 
     // draw check icon
@@ -373,7 +381,7 @@ void DropDown::messureSize()
     }
     if (iconSize.x > 0) szContent.x += iconSize.x + (text_off ? 0 : 5);
     if (iconSize.y > szContent.y) szContent.y = iconSize.y;
-    szContent.y += 10;
+    szContent.y += items_padding;
     if (texts.size() > 15) szContent.x += 6;
     if (GetParent()) {
         auto x = GetParent()->GetSize().x;
@@ -432,6 +440,13 @@ void DropDown::mouseDown(wxMouseEvent& event)
         return;
     // force calc hover item again
     mouseMove(event);
+
+    const wxSize size = GetSize();
+    const int height = rowSize.y * int(texts.size());
+    const wxRect rect = { size.x - slider_width, -offset.y * size.y / height, slider_width - 2,
+                      size.y * size.y / height };
+    slider_grabbed = rect.Contains(event.GetPosition());
+
     pressedDown = true;
     CaptureMouse();
     dragStart   = event.GetPosition();
@@ -442,6 +457,7 @@ void DropDown::mouseReleased(wxMouseEvent& event)
     if (pressedDown) {
         dragStart = wxPoint();
         pressedDown = false;
+        slider_grabbed = false;
         if (HasCapture())
             ReleaseMouse();
         if (hover_item >= 0) { // not moved
@@ -462,7 +478,10 @@ void DropDown::mouseMove(wxMouseEvent &event)
     wxPoint pt  = event.GetPosition();
     int text_size = int(texts.size());
     if (pressedDown) {
-        wxPoint pt2 = offset + pt - dragStart;
+        const int height = rowSize.y * text_size;
+        const int y_step = slider_grabbed ? -height / GetSize().y : 1;
+
+        wxPoint pt2 = offset + (pt - dragStart)*y_step;
         dragStart = pt;
         if (pt2.y > 0)
             pt2.y = 0;
@@ -477,7 +496,7 @@ void DropDown::mouseMove(wxMouseEvent &event)
     }
     if (!pressedDown || hover_item >= 0) {
         int hover = (pt.y - offset.y) / rowSize.y;
-        if (hover >= text_size) hover = -1;
+        if (hover >= text_size || slider_grabbed) hover = -1;
         if (hover == hover_item) return;
         hover_item = hover;
         if (hover >= 0)
@@ -489,7 +508,7 @@ void DropDown::mouseMove(wxMouseEvent &event)
 void DropDown::mouseWheelMoved(wxMouseEvent &event)
 {
     auto delta = event.GetWheelRotation() > 0 ? rowSize.y : -rowSize.y;
-    wxPoint pt2 = offset + wxPoint{0, delta};
+    wxPoint pt2 = offset + wxPoint{0, slider_step * delta};
     int text_size = int(texts.size());
     if (pt2.y > 0)
         pt2.y = 0;
diff --git a/src/slic3r/GUI/Widgets/DropDown.hpp b/src/slic3r/GUI/Widgets/DropDown.hpp
index 87eccd0238..8a4757f5f7 100644
--- a/src/slic3r/GUI/Widgets/DropDown.hpp
+++ b/src/slic3r/GUI/Widgets/DropDown.hpp
@@ -41,6 +41,7 @@ class DropDown : public wxPopupTransientWindow
     ScalableBitmap check_bitmap;
 
     bool pressedDown = false;
+    bool slider_grabbed = false;
     boost::posix_time::ptime dismissTime;
     wxPoint                  offset; // x not used
     wxPoint                  dragStart;
diff --git a/src/slic3r/GUI/Widgets/StaticBox.cpp b/src/slic3r/GUI/Widgets/StaticBox.cpp
index f2dd175f39..9e7b18ba9d 100644
--- a/src/slic3r/GUI/Widgets/StaticBox.cpp
+++ b/src/slic3r/GUI/Widgets/StaticBox.cpp
@@ -24,10 +24,10 @@ StaticBox::StaticBox()
 {
     border_color = StateColor(std::make_pair(clr_border_disabled,   (int) StateColor::Disabled),
 #ifndef __WXMSW__
-                              std::make_pair(clr_border_nornal,     (int) StateColor::Focused),
+                              std::make_pair(clr_border_normal,     (int) StateColor::Focused),
 #endif
                               std::make_pair(clr_border_hovered,    (int) StateColor::Hovered),
-                              std::make_pair(clr_border_nornal,     (int) StateColor::Normal));
+                              std::make_pair(clr_border_normal,     (int) StateColor::Normal));
 #ifndef __WXMSW__
     border_color.setTakeFocusedAsHovered(false);
 #endif
diff --git a/src/slic3r/GUI/Widgets/UIColors.hpp b/src/slic3r/GUI/Widgets/UIColors.hpp
index fefa6efd71..14ecb6f64f 100644
--- a/src/slic3r/GUI/Widgets/UIColors.hpp
+++ b/src/slic3r/GUI/Widgets/UIColors.hpp
@@ -1,17 +1,17 @@
 #ifndef slic3r_UI_Colors_hpp_
 #define slic3r_UI_Colors_hpp_
 
-static const int clr_border_nornal      = 0x646464;//0xDBDBDB;
+static const int clr_border_normal      = 0x646464;//0xDBDBDB;
 static const int clr_border_hovered     = 0xED6B21;//0x00AE42;
 static const int clr_border_disabled    = 0x646464;//0xDBDBDB;
 
-static const int clr_background_nornal_light    = 0xFFFFFF;
-static const int clr_background_nornal_dark     = 0x2B2B2B;//0x434343;
+static const int clr_background_normal_light    = 0xFFFFFF;
+static const int clr_background_normal_dark     = 0x2B2B2B;//0x434343;
 static const int clr_background_focused         = 0xED6B21;//0xEDFAF2;
 static const int clr_background_disabled_dark   = 0x404040;//0xF0F0F0;
 static const int clr_background_disabled_light  = 0xD9D9D9;//0xF0F0F0;
 
-static const int clr_foreground_nornal      = 0x262E30;
+static const int clr_foreground_normal      = 0x262E30;
 static const int clr_foreground_focused     = 0x00AE42;
 static const int clr_foreground_disabled    = 0x909090;