diff --git a/src/main.cpp b/src/main.cpp
index 8ef268bd..3eacdf9f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,7 +17,7 @@ int main(int argc, char *argv[])
 
     QString style = VUtils::readFileFromDisk(":/resources/vnote.qss");
     if (!style.isEmpty()) {
-        VUtils::processStyle(style);
+        VUtils::processStyle(style, w.getPalette());
         app.setStyleSheet(style);
     }
 
diff --git a/src/resources/icons/arrow_dropdown.svg b/src/resources/icons/arrow_dropdown.svg
new file mode 100644
index 00000000..d46e9629
--- /dev/null
+++ b/src/resources/icons/arrow_dropdown.svg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 16.2.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 width="512px" height="512px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve">
+<g>
+	<polygon points="128,192 256,320 384,192 	"/>
+</g>
+</svg>
diff --git a/src/resources/vnote.qss b/src/resources/vnote.qss
index a2a860d0..c7d6afff 100644
--- a/src/resources/vnote.qss
+++ b/src/resources/vnote.qss
@@ -35,3 +35,44 @@ QDockWidget::close-button, QDockWidget::float-button {
 QDockWidget::close-button:hover, QDockWidget::float-button:hover {
     background-color: @hover-color;
 }
+
+/* QComboBox */
+QComboBox[OnMainWindow="true"] {
+    border: 1px solid grey;
+    background-color: @base-background;
+}
+
+QComboBox[OnMainWindow="true"]:on { /* shift the text when the popup opens */
+    padding-top: 3px;
+    padding-left: 4px;
+}
+
+QComboBox[OnMainWindow="true"]::drop-down {
+    subcontrol-origin: padding;
+    subcontrol-position: top right;
+    width: 20px;
+    border: none;
+    background: transparent;
+}
+
+QComboBox[OnMainWindow="true"]::down-arrow {
+    image: url(:/resources/icons/arrow_dropdown.svg);
+    width: 20px;
+}
+
+QComboBox[OnMainWindow="true"]::down-arrow:on { /* shift the arrow when popup is open */
+    top: 1px;
+    left: 1px;
+}
+
+QComboBox[OnMainWindow="true"]::item {
+    padding-left: 20px;
+    border: none;
+    height: 20px;
+}
+
+QComboBox[OnMainWindow="true"]::item:selected {
+    padding-left: 20px;
+    border: none;
+    background-color: @hover-color;
+}
diff --git a/src/utils/vutils.cpp b/src/utils/vutils.cpp
index 7298abdd..ffb03ae8 100644
--- a/src/utils/vutils.cpp
+++ b/src/utils/vutils.cpp
@@ -87,14 +87,8 @@ QString VUtils::generateImageFileName(const QString &path, const QString &title,
     return imageName;
 }
 
-void VUtils::processStyle(QString &style)
+void VUtils::processStyle(QString &style, const QVector<QPair<QString, QString> > &varMap)
 {
-    QVector<QPair<QString, QString> > varMap;
-
-    // Initialize varMap
-    addQssVarToMap(varMap, "base-color", "#4CAF50");
-    addQssVarToMap(varMap, "hover-color", "#42A5F5");
-
     // Process style
     for (int i = 0; i < varMap.size(); ++i) {
         const QPair<QString, QString> &map = varMap[i];
diff --git a/src/utils/vutils.h b/src/utils/vutils.h
index 7e5ad932..adc6ecd0 100644
--- a/src/utils/vutils.h
+++ b/src/utils/vutils.h
@@ -19,7 +19,7 @@ public:
     static QRgb QRgbFromString(const QString &str);
     static QString generateImageFileName(const QString &path, const QString &title,
                                          const QString &format = "png");
-    static void processStyle(QString &style);
+    static void processStyle(QString &style, const QVector<QPair<QString, QString> > &varMap);
     static bool isMarkdown(const QString &fileName);
     static inline QString directoryNameFromPath(const QString& path);
     static QString fileNameFromPath(const QString &path);
@@ -28,17 +28,8 @@ public:
     static void makeDirectory(const QString &path);
     static ClipboardOpType opTypeInClipboard();
     static bool copyFile(const QString &p_srcFilePath, const QString &p_destFilePath, bool p_isCut);
-private:
-    static inline void addQssVarToMap(QVector<QPair<QString, QString> > &map,
-                                      const QString &key, const QString &value);
 };
 
-inline void VUtils::addQssVarToMap(QVector<QPair<QString, QString> > &map,
-                                   const QString &key, const QString &value)
-{
-    map.append(QPair<QString, QString>(key, value));
-}
-
 inline QString VUtils::directoryNameFromPath(const QString &path)
 {
     return fileNameFromPath(path);
diff --git a/src/vmainwindow.cpp b/src/vmainwindow.cpp
index 861a20d5..e68935ca 100644
--- a/src/vmainwindow.cpp
+++ b/src/vmainwindow.cpp
@@ -19,6 +19,7 @@ VMainWindow::VMainWindow(QWidget *parent)
     setWindowIcon(QIcon(":/resources/icons/vnote.ico"));
     // Must be called before those who uses VConfigManager
     vnote = new VNote();
+    vnote->initPalette(palette());
     initPredefinedColorPixmaps();
     setupUI();
     initActions();
@@ -52,6 +53,7 @@ void VMainWindow::setupUI()
     notebookInfoBtn->setProperty("OnMainWindow", true);
 
     notebookComboBox = new QComboBox();
+    notebookComboBox->setProperty("OnMainWindow", true);
     notebookComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
     directoryTree = new VDirectoryTree(vnote);
 
@@ -821,3 +823,8 @@ void VMainWindow::restoreStateAndGeometry()
     }
     toolDock->setVisible(vconfig.getToolsDockChecked());
 }
+
+const QVector<QPair<QString, QString> >& VMainWindow::getPalette() const
+{
+    return vnote->getPallete();
+}
diff --git a/src/vmainwindow.h b/src/vmainwindow.h
index 81941fab..dd11d425 100644
--- a/src/vmainwindow.h
+++ b/src/vmainwindow.h
@@ -2,6 +2,9 @@
 #define VMAINWINDOW_H
 
 #include <QMainWindow>
+#include <QVector>
+#include <QPair>
+#include <QString>
 
 class QLabel;
 class QComboBox;
@@ -27,6 +30,7 @@ class VMainWindow : public QMainWindow
 public:
     VMainWindow(QWidget *parent = 0);
     ~VMainWindow();
+    const QVector<QPair<QString, QString> > &getPalette() const;
 
 private slots:
     void setCurNotebookIndex(int index);
diff --git a/src/vnote.cpp b/src/vnote.cpp
index 0d3a12c1..3cf635c3 100644
--- a/src/vnote.cpp
+++ b/src/vnote.cpp
@@ -21,6 +21,17 @@ VNote::VNote() : QObject()
     emit notebooksChanged(notebooks);
 }
 
+void VNote::initPalette(QPalette palette)
+{
+    m_palette.clear();
+
+    m_palette.append(QPair<QString, QString>("base-background",
+                                             palette.background().color().name()));
+    m_palette.append(QPair<QString, QString>("base-foreground",
+                                             palette.background().color().name()));
+    m_palette.append(QPair<QString, QString>("hover-color", "#42A5F5"));
+}
+
 void VNote::initTemplate()
 {
     if (templateHtml.isEmpty() || preTemplateHtml.isEmpty()
diff --git a/src/vnote.h b/src/vnote.h
index 7c274c1e..450b56d7 100644
--- a/src/vnote.h
+++ b/src/vnote.h
@@ -6,7 +6,9 @@
 #include <QSettings>
 #include <QFont>
 #include <QObject>
+#include <QPair>
 #include <QHash>
+#include <QPalette>
 #include "vnotebook.h"
 
 enum OpenFileMode {Read = 0, Edit};
@@ -34,6 +36,9 @@ public:
 
     QString getNotebookPath(const QString &name);
 
+    inline const QVector<QPair<QString, QString> > &getPallete() const;
+    void initPalette(QPalette palette);
+
 public slots:
     void updateTemplate();
 
@@ -48,6 +53,12 @@ signals:
 private:
     QVector<VNotebook> notebooks;
     QHash<QString, QString> notebookPathHash;
+    QVector<QPair<QString, QString> > m_palette;
 };
 
+inline const QVector<QPair<QString, QString> >& VNote::getPallete() const
+{
+    return m_palette;
+}
+
 #endif // VNOTE_H
diff --git a/src/vnote.qrc b/src/vnote.qrc
index b6edbc03..8c146490 100644
--- a/src/vnote.qrc
+++ b/src/vnote.qrc
@@ -69,5 +69,6 @@
         <file>resources/icons/paste.svg</file>
         <file>resources/icons/dir_item.svg</file>
         <file>resources/icons/notebook_item.svg</file>
+        <file>resources/icons/arrow_dropdown.svg</file>
     </qresource>
 </RCC>