diff --git a/src/dialog/vsettingsdialog.cpp b/src/dialog/vsettingsdialog.cpp
index 4b044d28..69098501 100644
--- a/src/dialog/vsettingsdialog.cpp
+++ b/src/dialog/vsettingsdialog.cpp
@@ -56,6 +56,7 @@ VSettingsDialog::VSettingsDialog(QWidget *p_parent)
 
     // Add tabs.
     addTab(new VGeneralTab(), tr("General"));
+    addTab(new VLookTab(), tr("Appearance"));
     addTab(new VReadEditTab(), tr("Read/Edit"));
     addTab(new VNoteManagementTab(), tr("Note Management"));
     addTab(new VMarkdownTab(), tr("Markdown"));
@@ -144,18 +145,28 @@ void VSettingsDialog::addTab(QWidget *p_widget, const QString &p_label)
 
 void VSettingsDialog::loadConfiguration()
 {
+    int idx = 0;
     // General Tab.
     {
-        VGeneralTab *generalTab = dynamic_cast<VGeneralTab *>(m_tabs->widget(0));
+        VGeneralTab *generalTab = dynamic_cast<VGeneralTab *>(m_tabs->widget(idx++));
         Q_ASSERT(generalTab);
         if (!generalTab->loadConfiguration()) {
             goto err;
         }
     }
 
+    // Appearance Tab.
+    {
+        VLookTab *lookTab = dynamic_cast<VLookTab *>(m_tabs->widget(idx++));
+        Q_ASSERT(lookTab);
+        if (!lookTab->loadConfiguration()) {
+            goto err;
+        }
+    }
+
     // Read/Edit Tab.
     {
-        VReadEditTab *readEditTab = dynamic_cast<VReadEditTab *>(m_tabs->widget(1));
+        VReadEditTab *readEditTab = dynamic_cast<VReadEditTab *>(m_tabs->widget(idx++));
         Q_ASSERT(readEditTab);
         if (!readEditTab->loadConfiguration()) {
             goto err;
@@ -164,7 +175,7 @@ void VSettingsDialog::loadConfiguration()
 
     // Note Management Tab.
     {
-        VNoteManagementTab *noteManagementTab = dynamic_cast<VNoteManagementTab *>(m_tabs->widget(2));
+        VNoteManagementTab *noteManagementTab = dynamic_cast<VNoteManagementTab *>(m_tabs->widget(idx++));
         Q_ASSERT(noteManagementTab);
         if (!noteManagementTab->loadConfiguration()) {
             goto err;
@@ -173,7 +184,7 @@ void VSettingsDialog::loadConfiguration()
 
     // Markdown Tab.
     {
-        VMarkdownTab *markdownTab = dynamic_cast<VMarkdownTab *>(m_tabs->widget(3));
+        VMarkdownTab *markdownTab = dynamic_cast<VMarkdownTab *>(m_tabs->widget(idx++));
         Q_ASSERT(markdownTab);
         if (!markdownTab->loadConfiguration()) {
             goto err;
@@ -190,18 +201,28 @@ err:
 
 void VSettingsDialog::saveConfiguration()
 {
+    int idx = 0;
     // General Tab.
     {
-        VGeneralTab *generalTab = dynamic_cast<VGeneralTab *>(m_tabs->widget(0));
+        VGeneralTab *generalTab = dynamic_cast<VGeneralTab *>(m_tabs->widget(idx++));
         Q_ASSERT(generalTab);
         if (!generalTab->saveConfiguration()) {
             goto err;
         }
     }
 
+    // Appearance Tab.
+    {
+        VLookTab *lookTab = dynamic_cast<VLookTab *>(m_tabs->widget(idx++));
+        Q_ASSERT(lookTab);
+        if (!lookTab->saveConfiguration()) {
+            goto err;
+        }
+    }
+
     // Read/Edit Tab.
     {
-        VReadEditTab *readEditTab = dynamic_cast<VReadEditTab *>(m_tabs->widget(1));
+        VReadEditTab *readEditTab = dynamic_cast<VReadEditTab *>(m_tabs->widget(idx++));
         Q_ASSERT(readEditTab);
         if (!readEditTab->saveConfiguration()) {
             goto err;
@@ -210,7 +231,7 @@ void VSettingsDialog::saveConfiguration()
 
     // Note Management Tab.
     {
-        VNoteManagementTab *noteManagementTab = dynamic_cast<VNoteManagementTab *>(m_tabs->widget(2));
+        VNoteManagementTab *noteManagementTab = dynamic_cast<VNoteManagementTab *>(m_tabs->widget(idx++));
         Q_ASSERT(noteManagementTab);
         if (!noteManagementTab->saveConfiguration()) {
             goto err;
@@ -219,7 +240,7 @@ void VSettingsDialog::saveConfiguration()
 
     // Markdown Tab.
     {
-        VMarkdownTab *markdownTab = dynamic_cast<VMarkdownTab *>(m_tabs->widget(3));
+        VMarkdownTab *markdownTab = dynamic_cast<VMarkdownTab *>(m_tabs->widget(idx++));
         Q_ASSERT(markdownTab);
         if (!markdownTab->saveConfiguration()) {
             goto err;
@@ -443,6 +464,51 @@ bool VGeneralTab::saveStartupPageType()
     return true;
 }
 
+VLookTab::VLookTab(QWidget *p_parent)
+    : QWidget(p_parent)
+{
+    m_tbIconSizeSpin = new QSpinBox(this);
+    m_tbIconSizeSpin->setToolTip(tr("Icon size in pixel of tool bar (restart VNote to make it work)"));
+    m_tbIconSizeSpin->setMaximum(100);
+    m_tbIconSizeSpin->setMinimum(5);
+
+    QFormLayout *layout = new QFormLayout();
+    layout->addRow(tr("Tool bar icon size:"), m_tbIconSizeSpin);
+
+    setLayout(layout);
+}
+
+bool VLookTab::loadConfiguration()
+{
+    if (!loadToolBarIconSize()) {
+        return false;
+    }
+
+    return true;
+}
+
+bool VLookTab::saveConfiguration()
+{
+    if (!saveToolBarIconSize()) {
+        return false;
+    }
+
+    return true;
+}
+
+bool VLookTab::loadToolBarIconSize()
+{
+    int sz = g_config->getToolBarIconSize();
+    m_tbIconSizeSpin->setValue(sz);
+    return true;
+}
+
+bool VLookTab::saveToolBarIconSize()
+{
+    g_config->setToolBarIconSize(m_tbIconSizeSpin->value());
+    return true;
+}
+
 VReadEditTab::VReadEditTab(QWidget *p_parent)
     : QWidget(p_parent)
 {
@@ -899,6 +965,11 @@ VMarkdownTab::VMarkdownTab(QWidget *p_parent)
     QLabel *colorColumnLabel = new QLabel(tr("Color column:"));
     colorColumnLabel->setToolTip(m_colorColumnEdit->toolTip());
 
+    // MathJax.
+    m_mathjaxConfigEdit = new VLineEdit();
+    m_mathjaxConfigEdit->setToolTip(tr("Location of MathJax JavaScript and its configuration "
+                                       "(restart VNote to make it work in in-place preview)"));
+
     // PlantUML.
     m_plantUMLModeCombo = VUtils::getComboBox();
     m_plantUMLModeCombo->setToolTip(tr("Enable PlantUML support in Markdown"));
@@ -924,6 +995,7 @@ VMarkdownTab::VMarkdownTab(QWidget *p_parent)
     mainLayout->addRow(tr("Note open mode:"), m_openModeCombo);
     mainLayout->addRow(tr("Heading sequence:"), headingSequenceLayout);
     mainLayout->addRow(colorColumnLabel, m_colorColumnEdit);
+    mainLayout->addRow(tr("MathJax configuration:"), m_mathjaxConfigEdit);
     mainLayout->addRow(tr("PlantUML:"), m_plantUMLModeCombo);
     mainLayout->addRow(tr("PlantUML server:"), m_plantUMLServerEdit);
     mainLayout->addRow(tr("PlantUML JAR:"), m_plantUMLJarEdit);
@@ -947,6 +1019,10 @@ bool VMarkdownTab::loadConfiguration()
         return false;
     }
 
+    if (!loadMathJax()) {
+        return false;
+    }
+
     if (!loadPlantUML()) {
         return false;
     }
@@ -972,6 +1048,10 @@ bool VMarkdownTab::saveConfiguration()
         return false;
     }
 
+    if (!saveMathJax()) {
+        return false;
+    }
+
     if (!savePlantUML()) {
         return false;
     }
@@ -1051,6 +1131,18 @@ bool VMarkdownTab::saveColorColumn()
     return true;
 }
 
+bool VMarkdownTab::loadMathJax()
+{
+    m_mathjaxConfigEdit->setText(g_config->getMathjaxJavascript());
+    return true;
+}
+
+bool VMarkdownTab::saveMathJax()
+{
+    g_config->setMathjaxJavascript(m_mathjaxConfigEdit->text());
+    return true;
+}
+
 bool VMarkdownTab::loadPlantUML()
 {
     m_plantUMLModeCombo->setCurrentIndex(m_plantUMLModeCombo->findData(g_config->getPlantUMLMode()));
diff --git a/src/dialog/vsettingsdialog.h b/src/dialog/vsettingsdialog.h
index 6468a6dc..666d4635 100644
--- a/src/dialog/vsettingsdialog.h
+++ b/src/dialog/vsettingsdialog.h
@@ -9,6 +9,7 @@ class QDialogButtonBox;
 class QComboBox;
 class QGroupBox;
 class QDoubleSpinBox;
+class QSpinBox;
 class QCheckBox;
 class VLineEdit;
 class QStackedLayout;
@@ -54,6 +55,22 @@ private:
     static const QVector<QString> c_availableLangs;
 };
 
+class VLookTab: public QWidget
+{
+    Q_OBJECT
+public:
+    explicit VLookTab(QWidget *p_parent = 0);
+    bool loadConfiguration();
+    bool saveConfiguration();
+
+private:
+    bool loadToolBarIconSize();
+    bool saveToolBarIconSize();
+
+    // Tool bar icon size.
+    QSpinBox *m_tbIconSizeSpin;
+};
+
 class VReadEditTab : public QWidget
 {
     Q_OBJECT
@@ -157,6 +174,9 @@ private:
     bool loadColorColumn();
     bool saveColorColumn();
 
+    bool loadMathJax();
+    bool saveMathJax();
+
     bool loadPlantUML();
     bool savePlantUML();
 
@@ -173,6 +193,9 @@ private:
     // Color column in code block.
     VLineEdit *m_colorColumnEdit;
 
+    // MathJax.
+    VLineEdit *m_mathjaxConfigEdit;
+
     // PlantUML.
     QComboBox *m_plantUMLModeCombo;
     VLineEdit *m_plantUMLServerEdit;
diff --git a/src/resources/docs/shortcuts_en.md b/src/resources/docs/shortcuts_en.md
index f8239958..7f85de24 100644
--- a/src/resources/docs/shortcuts_en.md
+++ b/src/resources/docs/shortcuts_en.md
@@ -105,8 +105,8 @@ Expand the selection to the beginning or end of current line.
 - `Ctrl+Shift+Home`, `Ctrl+Shift+End`  
 Expand the selection to the beginning or end of current note.
 
-## Custom Shortcuts
-VNote supports customing some standard shortcuts, though it is not recommended. VNote stores shortcuts' configuration information in the `[shortcuts]` and `[captain_mode_shortcuts]` sections of user configuration file `vnote.ini`.
+## Customize Shortcuts
+VNote supports customizing some standard shortcuts, though it is not recommended. VNote stores shortcuts' configuration information in the `[shortcuts]` and `[captain_mode_shortcuts]` sections of user configuration file `vnote.ini`.
 
 For example, the default configruation may look like this:
 
@@ -114,7 +114,7 @@ For example, the default configruation may look like this:
 [shortcuts]
 ; Define shortcuts here, with each item in the form "operation=keysequence".
 ; Leave keysequence empty to disable the shortcut of an operation.
-; Custom shortcuts may conflict with some key bindings in edit mode or Vim mode.
+; Customized shortcuts may conflict with some key bindings in edit mode or Vim mode.
 ; Ctrl+Q is reserved for quitting VNote.
 
 ; Leader key of Captain mode
diff --git a/src/resources/docs/tips_custom_shortcut_en.md b/src/resources/docs/tips_custom_shortcut_en.md
index bc0f1920..30f04629 100644
--- a/src/resources/docs/tips_custom_shortcut_en.md
+++ b/src/resources/docs/tips_custom_shortcut_en.md
@@ -1,5 +1,5 @@
-# Custom Shortcuts
-VNote supports customing some standard shortcuts, though it is not recommended. VNote stores shortcuts' configuration information in the `[shortcuts]` and `[captain_mode_shortcuts]` sections of user configuration file `vnote.ini`.
+# Customize Shortcuts
+VNote supports customizing some standard shortcuts, though it is not recommended. VNote stores shortcuts' configuration information in the `[shortcuts]` and `[captain_mode_shortcuts]` sections of user configuration file `vnote.ini`.
 
 For example, the default configruation may look like this:
 
@@ -7,7 +7,7 @@ For example, the default configruation may look like this:
 [shortcuts]
 ; Define shortcuts here, with each item in the form "operation=keysequence".
 ; Leave keysequence empty to disable the shortcut of an operation.
-; Custom shortcuts may conflict with some key bindings in edit mode or Vim mode.
+; Customized shortcuts may conflict with some key bindings in edit mode or Vim mode.
 ; Ctrl+Q is reserved for quitting VNote.
 
 ; Leader key of Captain mode
diff --git a/src/resources/vnote.ini b/src/resources/vnote.ini
index 1355a07c..1e68b0b2 100644
--- a/src/resources/vnote.ini
+++ b/src/resources/vnote.ini
@@ -287,7 +287,7 @@ graphviz_dot=
 [shortcuts]
 ; Define shortcuts here, with each item in the form "operation=keysequence".
 ; Leave keysequence empty to disable the shortcut of an operation.
-; Custom shortcuts may conflict with some key bindings in edit mode or Vim mode.
+; Customized shortcuts may conflict with some key bindings in edit mode or Vim mode.
 ; Ctrl+Q is reserved for quitting VNote.
 
 ; Leader key of Captain mode
diff --git a/src/vconfigmanager.h b/src/vconfigmanager.h
index ee1b4cae..ff202d7b 100644
--- a/src/vconfigmanager.h
+++ b/src/vconfigmanager.h
@@ -324,6 +324,7 @@ public:
     void setEnableCodeBlockLineNumber(bool p_enabled);
 
     int getToolBarIconSize() const;
+    void setToolBarIconSize(int p_size);
 
     const MarkdownitOption &getMarkdownitOption() const;
     void setMarkdownitOption(const MarkdownitOption &p_opt);
@@ -339,6 +340,7 @@ public:
     void setConfirmReloadFolder(bool p_enabled);
 
     const QString &getMathjaxJavascript() const;
+    void setMathjaxJavascript(const QString &p_js);
 
     bool getDoubleClickCloseTab() const;
 
@@ -1860,6 +1862,17 @@ inline int VConfigManager::getToolBarIconSize() const
     return m_toolBarIconSize;
 }
 
+inline void VConfigManager::setToolBarIconSize(int p_size)
+{
+    if (m_toolBarIconSize == p_size) {
+        return;
+    }
+
+    m_toolBarIconSize  = p_size;
+    setConfigToSettings("global",
+                        "tool_bar_icon_size",
+                        m_toolBarIconSize);
+}
 inline const MarkdownitOption &VConfigManager::getMarkdownitOption() const
 {
     return m_markdownItOpt;
@@ -1924,6 +1937,22 @@ inline const QString &VConfigManager::getMathjaxJavascript() const
     return m_mathjaxJavascript;
 }
 
+inline void VConfigManager::setMathjaxJavascript(const QString &p_js)
+{
+    if (m_mathjaxJavascript == p_js) {
+        return;
+    }
+
+    if (p_js.isEmpty()) {
+        m_mathjaxJavascript = resetDefaultConfig("web", "mathjax_javascript").toString();
+    } else {
+        m_mathjaxJavascript = p_js;
+        setConfigToSettings("web",
+                            "mathjax_javascript",
+                            m_mathjaxJavascript);
+    }
+}
+
 inline bool VConfigManager::getDoubleClickCloseTab() const
 {
     return m_doubleClickCloseTab;
diff --git a/src/vmainwindow.cpp b/src/vmainwindow.cpp
index 0c5fd2f1..6156829d 100644
--- a/src/vmainwindow.cpp
+++ b/src/vmainwindow.cpp
@@ -3073,7 +3073,7 @@ void VMainWindow::initThemeMenu(QMenu *p_menu)
 void VMainWindow::customShortcut()
 {
     VTipsDialog dialog(VUtils::getDocFile("tips_custom_shortcut.md"),
-                       tr("Custom Shortcuts"),
+                       tr("Customize Shortcuts"),
                        []() {
 #if defined(Q_OS_MACOS) || defined(Q_OS_MAC)
                            // On macOS, it seems that we could not open that ini file directly.