diff --git a/src/main.cpp b/src/main.cpp
index e5390f42..8ef268bd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,8 @@
 #include "vmainwindow.h"
 #include <QApplication>
+#include <QFile>
 #include <QTextCodec>
+#include "utils/vutils.h"
 
 int main(int argc, char *argv[])
 {
@@ -13,5 +15,11 @@ int main(int argc, char *argv[])
     VMainWindow w;
     w.show();
 
+    QString style = VUtils::readFileFromDisk(":/resources/vnote.qss");
+    if (!style.isEmpty()) {
+        VUtils::processStyle(style);
+        app.setStyleSheet(style);
+    }
+
     return app.exec();
 }
diff --git a/src/resources/icons/create_rootdir_tb.svg b/src/resources/icons/create_rootdir_tb.svg
index 610c0cf5..fa77fea2 100644
--- a/src/resources/icons/create_rootdir_tb.svg
+++ b/src/resources/icons/create_rootdir_tb.svg
@@ -2,13 +2,9 @@
 <!-- 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" style="enable-background:new 0 0 512 512;" xml:space="preserve">
-<g>
-	<path d="M430.1,192H81.9c-17.7,0-18.6,9.2-17.6,20.5l13,183c0.9,11.2,3.5,20.5,21.1,20.5h316.2c18,0,20.1-9.2,21.1-20.5l12.1-185.3
-		C448.7,199,447.8,192,430.1,192z"/>
-	<g>
-		<path d="M426.2,143.3c-0.5-12.4-4.5-15.3-15.1-15.3c0,0-121.4,0-143.2,0c-21.8,0-24.4,0.3-40.9-17.4C213.3,95.8,218.7,96,190.4,96
-			c-22.6,0-75.3,0-75.3,0c-17.4,0-23.6-1.5-25.2,16.6c-1.5,16.7-5,57.2-5.5,63.4h343.4L426.2,143.3z"/>
-	</g>
-</g>
+	 width="512px" height="512px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve">
+<path d="M437.334,144H256.006l-42.668-48H74.666C51.197,96,32,115.198,32,138.667v234.666C32,396.802,51.197,416,74.666,416h362.668
+	C460.803,416,480,396.802,480,373.333V186.667C480,163.198,460.803,144,437.334,144z M448,373.333
+	c0,5.782-4.885,10.667-10.666,10.667H74.666C68.884,384,64,379.115,64,373.333V176h373.334c5.781,0,10.666,4.885,10.666,10.667
+	V373.333z"/>
 </svg>
diff --git a/src/resources/vnote.qss b/src/resources/vnote.qss
new file mode 100644
index 00000000..a2a860d0
--- /dev/null
+++ b/src/resources/vnote.qss
@@ -0,0 +1,37 @@
+QPushButton[OnMainWindow="true"] {
+    padding: 3px;
+    border: none;
+    background-color: transparent;
+}
+
+QPushButton[OnMainWindow="true"]::menu-indicator {
+    image: none;
+}
+
+QPushButton[OnMainWindow="true"]::hover {
+    background-color: @hover-color;
+}
+
+QToolBar {
+    border: none;
+}
+
+QToolButton::hover {
+    background-color: @hover-color;
+}
+
+QMenuBar {
+    border: none;
+}
+
+QMenuBar::item:selected {
+    background-color: @hover-color;
+}
+
+QDockWidget::close-button, QDockWidget::float-button {
+    border: none;
+}
+
+QDockWidget::close-button:hover, QDockWidget::float-button:hover {
+    background-color: @hover-color;
+}
diff --git a/src/utils/vutils.cpp b/src/utils/vutils.cpp
index 3f9f3817..1a4b0360 100644
--- a/src/utils/vutils.cpp
+++ b/src/utils/vutils.cpp
@@ -76,3 +76,18 @@ QString VUtils::generateImageFileName(const QString &path, const QString &title,
     }
     return imageName;
 }
+
+void VUtils::processStyle(QString &style)
+{
+    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];
+        style.replace("@" + map.first, map.second);
+    }
+}
diff --git a/src/utils/vutils.h b/src/utils/vutils.h
index 43f99618..59110517 100644
--- a/src/utils/vutils.h
+++ b/src/utils/vutils.h
@@ -3,6 +3,8 @@
 
 #include <QString>
 #include <QColor>
+#include <QVector>
+#include <QPair>
 #include "vconfigmanager.h"
 
 class VUtils
@@ -16,6 +18,16 @@ 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);
+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));
+}
+
 #endif // VUTILS_H
diff --git a/src/veditarea.cpp b/src/veditarea.cpp
index 44e43dd2..a2c3739c 100644
--- a/src/veditarea.cpp
+++ b/src/veditarea.cpp
@@ -21,6 +21,7 @@ void VEditArea::setupUI()
 
     QHBoxLayout *mainLayout = new QHBoxLayout();
     mainLayout->addWidget(splitter);
+    mainLayout->setContentsMargins(0, 0, 0, 0);
 
     setLayout(mainLayout);
 }
diff --git a/src/vedittab.cpp b/src/vedittab.cpp
index 0ad88bed..3857d45b 100644
--- a/src/vedittab.cpp
+++ b/src/vedittab.cpp
@@ -258,17 +258,19 @@ void VEditTab::updateTocFromHtml(const QString &tocHtml)
     QVector<VHeader> &headers = tableOfContent.headers;
     headers.clear();
 
-    QXmlStreamReader xml(tocHtml);
-    if (xml.readNextStartElement()) {
-        if (xml.name() == "ul") {
-            parseTocUl(xml, headers, 1);
-        } else {
-            qWarning() << "error: TOC HTML does not start with <ul>";
+    if (!tocHtml.isEmpty()) {
+        QXmlStreamReader xml(tocHtml);
+        if (xml.readNextStartElement()) {
+            if (xml.name() == "ul") {
+                parseTocUl(xml, headers, 1);
+            } else {
+                qWarning() << "error: TOC HTML does not start with <ul>";
+            }
+        }
+        if (xml.hasError()) {
+            qWarning() << "error: fail to parse TOC in HTML";
+            return;
         }
-    }
-    if (xml.hasError()) {
-        qWarning() << "error: fail to parse TOC in HTML";
-        return;
     }
 
     tableOfContent.filePath = QDir::cleanPath(QDir(noteFile->basePath).filePath(noteFile->fileName));
diff --git a/src/veditwindow.cpp b/src/veditwindow.cpp
index c91a8d36..c37c6194 100644
--- a/src/veditwindow.cpp
+++ b/src/veditwindow.cpp
@@ -42,6 +42,7 @@ void VEditWindow::setupCornerWidget()
 
     rightBtn = new QPushButton(QIcon(":/resources/icons/corner_menu.svg"),
                                "", this);
+    rightBtn->setProperty("OnMainWindow", true);
     QMenu *rightMenu = new QMenu(this);
     rightMenu->addAction(splitAct);
     rightMenu->addAction(removeSplitAct);
@@ -54,6 +55,7 @@ void VEditWindow::setupCornerWidget()
             this, &VEditWindow::tabListJump);
     leftBtn = new QPushButton(QIcon(":/resources/icons/corner_tablist.svg"),
                               "", this);
+    leftBtn->setProperty("OnMainWindow", true);
     QMenu *leftMenu = new QMenu(this);
     leftBtn->setMenu(leftMenu);
     setCornerWidget(leftBtn, Qt::TopLeftCorner);
diff --git a/src/vfilelist.cpp b/src/vfilelist.cpp
index da547e3a..c4961c15 100644
--- a/src/vfilelist.cpp
+++ b/src/vfilelist.cpp
@@ -20,6 +20,7 @@ void VFileList::setupUI()
 
     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout->addWidget(fileList);
+    mainLayout->setContentsMargins(0, 0, 0, 0);
 
     connect(fileList, &QListWidget::customContextMenuRequested,
             this, &VFileList::contextMenuRequested);
diff --git a/src/vmainwindow.cpp b/src/vmainwindow.cpp
index b73b3f22..82b31d27 100644
--- a/src/vmainwindow.cpp
+++ b/src/vmainwindow.cpp
@@ -42,10 +42,13 @@ void VMainWindow::setupUI()
 
     newNotebookBtn = new QPushButton(QIcon(":/resources/icons/create_notebook.svg"), "");
     newNotebookBtn->setToolTip(tr("Create a new notebook"));
+    newNotebookBtn->setProperty("OnMainWindow", true);
     deleteNotebookBtn = new QPushButton(QIcon(":/resources/icons/delete_notebook.svg"), "");
     deleteNotebookBtn->setToolTip(tr("Delete current notebook"));
+    deleteNotebookBtn->setProperty("OnMainWindow", true);
     notebookInfoBtn = new QPushButton(QIcon(":/resources/icons/notebook_info.svg"), "");
     notebookInfoBtn->setToolTip(tr("View and edit current notebook's information"));
+    notebookInfoBtn->setProperty("OnMainWindow", true);
 
     notebookComboBox = new QComboBox();
     notebookComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
@@ -57,14 +60,13 @@ void VMainWindow::setupUI()
     nbBtnLayout->addWidget(newNotebookBtn);
     nbBtnLayout->addWidget(deleteNotebookBtn);
     nbBtnLayout->addWidget(notebookInfoBtn);
-    QHBoxLayout *dirBtnLayout = new QHBoxLayout;
-    dirBtnLayout->addWidget(directoryLabel);
-    dirBtnLayout->addStretch();
+    nbBtnLayout->setContentsMargins(0, 0, 0, 0);
     QVBoxLayout *nbLayout = new QVBoxLayout;
     nbLayout->addLayout(nbBtnLayout);
     nbLayout->addWidget(notebookComboBox);
-    nbLayout->addLayout(dirBtnLayout);
+    nbLayout->addWidget(directoryLabel);
     nbLayout->addWidget(directoryTree);
+    nbLayout->setContentsMargins(5, 0, 0, 0);
     QWidget *nbContainer = new QWidget();
     nbContainer->setLayout(nbLayout);
     nbContainer->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Expanding);
diff --git a/src/vnote.qrc b/src/vnote.qrc
index a337cd4b..c7c01cfe 100644
--- a/src/vnote.qrc
+++ b/src/vnote.qrc
@@ -61,5 +61,6 @@
         <file>resources/icons/create_rootdir_tb.svg</file>
         <file>resources/icons/vnote.svg</file>
         <file>resources/icons/vnote.ico</file>
+        <file>resources/vnote.qss</file>
     </qresource>
 </RCC>