diff --git a/components/slider.cpp b/components/slider.cpp
index 97c4c0c..34447f5 100644
--- a/components/slider.cpp
+++ b/components/slider.cpp
@@ -1,4 +1,6 @@
 #include "slider.h"
+#include <QPainter>
+
 #include "slider_p.h"
 
 Slider::Slider(QWidget *parent)
@@ -10,3 +12,20 @@ Slider::Slider(QWidget *parent)
 Slider::~Slider()
 {
 }
+
+void Slider::paintEvent(QPaintEvent *event)
+{
+    Q_UNUSED(event)
+
+    QPainter painter(this);
+
+#ifdef DEBUG_LAYOUT
+    QPen pen;
+    pen.setColor(Qt::red);
+    pen.setWidth(1);
+    painter.setOpacity(1);
+    painter.setPen(pen);
+    painter.setBrush(Qt::NoBrush);
+    painter.drawRect(rect().adjusted(0, 0, -1, -1));
+#endif
+}
diff --git a/components/slider.h b/components/slider.h
index 4b03cb2..07ad1b7 100644
--- a/components/slider.h
+++ b/components/slider.h
@@ -15,6 +15,8 @@ public:
     ~Slider();
 
 protected:
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+
     const QScopedPointer<SliderPrivate> d_ptr;
 
 private:
diff --git a/qt-material-widgets.pro b/qt-material-widgets.pro
index b8e3d18..16b5899 100644
--- a/qt-material-widgets.pro
+++ b/qt-material-widgets.pro
@@ -5,7 +5,7 @@ greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 TARGET = qt-material-widgets
 TEMPLATE = app
 
-#DEFINES += DEBUG_LAYOUT=1
+DEFINES += DEBUG_LAYOUT=1
 
 SOURCES += main.cpp\
         mainwindow.cpp \