diff --git a/testbed/imgui/imgui.cpp b/testbed/imgui/imgui.cpp
index 77fdae25..6c962314 100644
--- a/testbed/imgui/imgui.cpp
+++ b/testbed/imgui/imgui.cpp
@@ -149,7 +149,8 @@ struct GuiState
                 mx(-1), my(-1), scroll(0),
                 active(0), hot(0), hotToBe(0), isHot(false), isActive(false), wentActive(false),
                 dragX(0), dragY(0), dragOrig(0), widgetX(0), widgetY(0), widgetW(100),
-                insideCurrentScroll(false),  nextItemSameLine(false), areaId(0), widgetId(0)
+                insideCurrentScroll(false),  nextItemSameLine(false), newLinePreviousX(0),
+                areaId(0), widgetId(0)
         {
         }
 
@@ -168,6 +169,7 @@ struct GuiState
         int widgetX, widgetY, widgetW;
         bool insideCurrentScroll;
         bool nextItemSameLine;
+        int newLinePreviousX;
 
         unsigned int areaId;
         unsigned int widgetId;
@@ -324,7 +326,7 @@ bool imguiBeginScrollArea(const char* name, int x, int y, int w, int h, int* scr
         const int areaHeading = name ? AREA_HEADER : 0;
 
         g_state.widgetX = x + SCROLL_AREA_PADDING;
-        g_state.widgetY = y+h-areaHeading + (*scroll);
+        g_state.widgetY = y+h-areaHeading + (*scroll) - SCROll_AREA_TOP_PADDING;
         g_state.widgetW = w - SCROLL_AREA_PADDING*4;
         g_scrollTop = y-areaHeading+h;
         g_scrollBottom = y+SCROLL_AREA_PADDING;
@@ -339,7 +341,7 @@ bool imguiBeginScrollArea(const char* name, int x, int y, int w, int h, int* scr
         g_insideScrollArea = inRect(x, y, w, h, false);
         g_state.insideCurrentScroll = g_insideScrollArea;
 
-        addGfxCmdRoundedRect((float)x, (float)y, (float)w, (float)h, 6, imguiRGBA(0,0,0,192));
+        addGfxCmdRoundedRect((float)x, (float)y, (float)w, (float)h, 6, imguiRGBA(40,40,40,192));
 
         if (name) addGfxCmdText(x+areaHeading/2, y+h-areaHeading/2-TEXT_HEIGHT/2, IMGUI_ALIGN_LEFT, name, imguiRGBA(255,255,255,128));
 
@@ -430,10 +432,10 @@ bool imguiButton(const char* text, bool enabled, int width)
         int w = width > 0 ? width : g_state.widgetW;
         int h = BUTTON_HEIGHT;
         if (g_state.nextItemSameLine) {
-            g_state.widgetX += width + DEFAULT_HORIZONTAL_SPACING;
+            g_state.widgetX += width;
         }
         else {
-            g_state.widgetY -= BUTTON_HEIGHT + DEFAULT_VERTICAL_SPACING;
+            g_state.widgetY -= BUTTON_HEIGHT;
         }
 
         bool over = enabled && inRect(x, y, w, h);
@@ -482,7 +484,12 @@ bool imguiCheck(const char* text, bool checked, bool enabled)
         int y = g_state.widgetY - BUTTON_HEIGHT;
         int w = g_state.widgetW;
         int h = BUTTON_HEIGHT;
-        g_state.widgetY -= BUTTON_HEIGHT + DEFAULT_VERTICAL_SPACING;
+        if (g_state.nextItemSameLine) {
+            g_state.widgetX += w;
+        }
+        else {
+            g_state.widgetY -= BUTTON_HEIGHT;
+        }
 
         bool over = enabled && inRect(x, y, w, h);
         bool res = buttonLogic(id, over);
@@ -626,40 +633,35 @@ bool imguiSlider(const char* text, float* val, float vmin, float vmax, float vin
         return res || valChanged;
 }
 
-void imguiStartLineOfItems() {
+void imguiStartLine() {
     g_state.nextItemSameLine = true;
+    g_state.newLinePreviousX = g_state.widgetX;
 }
 
-void imguiEndLineOfItems() {
+void imguiEndLine() {
     g_state.nextItemSameLine = false;
+    g_state.widgetX = g_state.newLinePreviousX;
+    g_state.newLinePreviousX = 0;
 }
 
-void imguiIndent()
+void imguiVerticalSpace(int spaceY)
 {
-        g_state.widgetX += INDENT_SIZE;
-        g_state.widgetW -= INDENT_SIZE;
+    g_state.widgetY -= spaceY;
 }
 
-void imguiUnindent()
-{
-        g_state.widgetX -= INDENT_SIZE;
-        g_state.widgetW += INDENT_SIZE;
-}
-
-void imguiSeparator()
-{
-        g_state.widgetY -= DEFAULT_VERTICAL_SPACING*3;
+void imguiHorizontalSpace(int spaceX) {
+    g_state.widgetX += spaceX;
 }
 
 void imguiSeparatorLine()
 {
         int x = g_state.widgetX;
-        int y = g_state.widgetY - DEFAULT_VERTICAL_SPACING*2;
+        int y = g_state.widgetY;
         int w = g_state.widgetW;
-        int h = 1;
-        g_state.widgetY -= DEFAULT_VERTICAL_SPACING*4;
+        int h = SEPARATOR_LINE_WIDTH;
+        g_state.widgetY -= SEPARATOR_LINE_WIDTH;
 
-        addGfxCmdRect((float)x, (float)y, (float)w, (float)h, imguiRGBA(255,255,255,32));
+        addGfxCmdRect((float)x, (float)y, (float)w, (float)h, imguiRGBA(255,255,255,70));
 }
 
 void imguiDrawText(int x, int y, int align, const char* text, unsigned int color)
diff --git a/testbed/imgui/imgui.h b/testbed/imgui/imgui.h
index 830b6d17..64f28109 100644
--- a/testbed/imgui/imgui.h
+++ b/testbed/imgui/imgui.h
@@ -23,16 +23,18 @@
 #define IMGUI_H
 
 static const int BUTTON_HEIGHT = 40;
-static const int SLIDER_HEIGHT = 20;
+static const int SLIDER_HEIGHT = 30;
 static const int SLIDER_MARKER_WIDTH = 10;
 static const int CHECK_SIZE = 18;
 static const int DEFAULT_VERTICAL_SPACING = 14;
 static const int DEFAULT_HORIZONTAL_SPACING = 14;
 static const int TEXT_HEIGHT = 16;
 static const int FONT_HEIGHT = 30;
-static const int SCROLL_AREA_PADDING = 6;
+static const int SCROll_AREA_TOP_PADDING = 5;
+static const int SCROLL_AREA_PADDING = 5;
 static const int INDENT_SIZE = 16;
-static const int AREA_HEADER = 28;
+static const int AREA_HEADER = 20;
+static const int SEPARATOR_LINE_WIDTH = 2;
 
 enum imguiMouseButton
 {
@@ -58,11 +60,12 @@ void imguiEndFrame();
 bool imguiBeginScrollArea(const char* name, int x, int y, int w, int h, int* scroll);
 void imguiEndScrollArea();
 
-void imguiStartLineOfItems();
-void imguiEndLineOfItems();
+void imguiStartLine();
+void imguiEndLine();
 void imguiIndent();
 void imguiUnindent();
-void imguiSeparator();
+void imguiVerticalSpace(int spaceY);
+void imguiHorizontalSpace(int spaceX);
 void imguiSeparatorLine();
 
 bool imguiButton(const char* text, bool enabled = true, int width = -1);
diff --git a/testbed/src/Gui.cpp b/testbed/src/Gui.cpp
index fe485b2d..c7619add 100644
--- a/testbed/src/Gui.cpp
+++ b/testbed/src/Gui.cpp
@@ -96,7 +96,9 @@ void Gui::displayHeader() {
                          app.mWindowToFramebufferRatio.x * windowWidth,
                          app.mWindowToFramebufferRatio.y * HEADER_HEIGHT, &scrollarea);
 
-    imguiStartLineOfItems();
+    imguiHorizontalSpace(10);
+    imguiVerticalSpace(20);
+    imguiStartLine();
 
     // ----- Left Pane Header ----- //
 
@@ -104,18 +106,20 @@ void Gui::displayHeader() {
     if (imguiButton(app.mTimer.isRunning() ? "Pause" : "Play", true, button_width)) {
         app.togglePlayPauseSimulation();
     }
+    imguiHorizontalSpace(5);
 
     // Step
     if (imguiButton("Step", !app.mTimer.isRunning(), button_width)) {
         app.toggleTakeSinglePhysicsStep();
     }
+    imguiHorizontalSpace(5);
 
     // Restart
     if (imguiButton("Restart", true, button_width)) {
         app.restartSimulation();
     }
 
-    imguiEndLineOfItems();
+    imguiEndLine();
     imguiEndScrollArea();
 }
 
@@ -131,21 +135,30 @@ void Gui::displayLeftPane() {
                          app.mWindowToFramebufferRatio.x * LEFT_PANE_WIDTH,
                          app.mWindowToFramebufferRatio.y * LEFT_PANE_HEADER_HEIGHT, &scrollarea);
 
-    imguiStartLineOfItems();
+    imguiSeparatorLine();
+    imguiVerticalSpace(5);
+    imguiStartLine();
 
     // ----- Left Pane Header ----- //
-    int widthButton = app.mWindowToFramebufferRatio.x * LEFT_PANE_WIDTH / 5;
+    int widthButton = app.mWindowToFramebufferRatio.x * LEFT_PANE_WIDTH / 4.3;
     if (imguiButton("Scenes", true, widthButton)) {
         mLeftPane = SCENES;
     }
+    imguiHorizontalSpace(5);
 
     if (imguiButton("Physics", true, widthButton)) {
         mLeftPane = PHYSICS;
     }
+    imguiHorizontalSpace(5);
 
     imguiButton("Rendering", true, widthButton);
+    imguiHorizontalSpace(5);
+
     imguiButton("Profiling", true, widthButton);
-    imguiEndLineOfItems();
+
+    imguiEndLine();
+    imguiVerticalSpace(BUTTON_HEIGHT + 8);
+    imguiSeparatorLine();
     imguiEndScrollArea();
 
     // Display the left pane content
@@ -175,6 +188,8 @@ void Gui::displayScenesPane() {
                          app.mWindowToFramebufferRatio.y * (windowHeight - HEADER_HEIGHT - LEFT_PANE_HEADER_HEIGHT),
                          &scrollarea);
 
+    imguiVerticalSpace(15);
+
     // For each scene
     for (int i=0; i<scenes.size(); i++) {
 
@@ -203,6 +218,8 @@ void Gui::displayPhysicsPane() {
                          app.mWindowToFramebufferRatio.y * (windowHeight - HEADER_HEIGHT - LEFT_PANE_HEADER_HEIGHT),
                          &scrollarea);
 
+    imguiVerticalSpace(15);
+
     // Enabled/Disable Sleeping
     bool toggle = imguiCheck("Sleeping enabled", app.mEngineSettings.isSleepingEnabled);
     if (toggle) {
@@ -302,7 +319,8 @@ void Gui::render() {
     }
 
     imguiBeginFrame(app.mWindowToFramebufferRatio.x * mouseX,
-                    app.mWindowToFramebufferRatio.y * (windowHeight - mouseY), mousebutton, -mScrollY);
+                    app.mWindowToFramebufferRatio.y * (windowHeight - mouseY), mousebutton,
+                    - app.mWindowToFramebufferRatio.y * mScrollY);
     resetScroll();
 
     displayHeader();
diff --git a/testbed/src/Gui.h b/testbed/src/Gui.h
index 53d07bef..0b2183a7 100644
--- a/testbed/src/Gui.h
+++ b/testbed/src/Gui.h
@@ -37,7 +37,7 @@
 const float GUI_SCALING = 2.0f;
 const int HEADER_HEIGHT = 80;
 const int LEFT_PANE_WIDTH = 300;
-const int LEFT_PANE_HEADER_HEIGHT = 60;
+const int LEFT_PANE_HEADER_HEIGHT = 50;
 
 using namespace openglframework;
 
diff --git a/testbed/src/TestbedApplication.cpp b/testbed/src/TestbedApplication.cpp
index 13c22318..d32b927f 100644
--- a/testbed/src/TestbedApplication.cpp
+++ b/testbed/src/TestbedApplication.cpp
@@ -131,7 +131,7 @@ void TestbedApplication::init() {
     glfwSetScrollCallback(mWindow, scroll);
 
     // Define the background color (black)
-    glClearColor(0.0, 0.0, 0.0, 1.0);
+    glClearColor(0, 0, 0, 1.0);
 
     // Create all the scenes
     createScenes();
@@ -164,7 +164,7 @@ void TestbedApplication::createScenes() {
     mScenes.push_back(raycastScene);
 
     assert(mScenes.size() > 0);
-    mCurrentScene = mScenes[1];
+    mCurrentScene = mScenes[0];
 
     // Get the engine settings from the scene
     mEngineSettings = mCurrentScene->getEngineSettings();