diff --git a/src/dialog/vdirinfodialog.h b/src/dialog/vdirinfodialog.h
index 5078b9cc..7e477e57 100644
--- a/src/dialog/vdirinfodialog.h
+++ b/src/dialog/vdirinfodialog.h
@@ -36,7 +36,7 @@ private:
     QString title;
     QString info;
 
-    VDirectory *m_parentDirectory;
     const VDirectory *m_directory;
+    VDirectory *m_parentDirectory;
 };
 #endif // VDIRINFODIALOG_H
diff --git a/src/dialog/vnewfiledialog.cpp b/src/dialog/vnewfiledialog.cpp
index 69009ff7..5b52fffc 100644
--- a/src/dialog/vnewfiledialog.cpp
+++ b/src/dialog/vnewfiledialog.cpp
@@ -43,7 +43,7 @@ void VNewFileDialog::setupUI()
 
     QFormLayout *topLayout = new QFormLayout();
     topLayout->addRow(nameLabel, nameEdit);
-    topLayout->addRow("", m_insertTitleCB);
+    topLayout->addWidget(m_insertTitleCB);
 
     m_warnLabel = new QLabel();
     m_warnLabel->setWordWrap(true);
diff --git a/src/dialog/vsettingsdialog.cpp b/src/dialog/vsettingsdialog.cpp
index 188e614d..efedb7b6 100644
--- a/src/dialog/vsettingsdialog.cpp
+++ b/src/dialog/vsettingsdialog.cpp
@@ -171,7 +171,7 @@ VGeneralTab::VGeneralTab(QWidget *p_parent)
     langLabel->setToolTip(m_langCombo->toolTip());
 
     // System tray checkbox.
-    m_systemTray = new QCheckBox(this);
+    m_systemTray = new QCheckBox(tr("System tray"), this);
     m_systemTray->setToolTip(tr("Minimized to the system tray after closing VNote"
                                 " (not supported in macOS)"));
 #if defined(Q_OS_MACOS) || defined(Q_OS_MAC)
@@ -179,12 +179,9 @@ VGeneralTab::VGeneralTab(QWidget *p_parent)
     m_systemTray->setEnabled(false);
 #endif
 
-    QLabel *trayLabel = new QLabel(tr("System tray:"), this);
-    trayLabel->setToolTip(m_systemTray->toolTip());
-
     QFormLayout *optionLayout = new QFormLayout();
     optionLayout->addRow(langLabel, m_langCombo);
-    optionLayout->addRow(trayLabel, m_systemTray);
+    optionLayout->addRow(m_systemTray);
 
     QVBoxLayout *mainLayout = new QVBoxLayout();
     mainLayout->addLayout(optionLayout);
@@ -271,24 +268,6 @@ VReadEditTab::VReadEditTab(QWidget *p_parent)
     m_readBox = new QGroupBox(tr("Read Mode (For Markdown Only)"));
     m_editBox = new QGroupBox(tr("Edit Mode"));
 
-    // Web Zoom Factor.
-    m_customWebZoom = new QCheckBox(tr("Custom Web zoom factor"), this);
-    m_customWebZoom->setToolTip(tr("Set the zoom factor of the Web page when reading"));
-    connect(m_customWebZoom, &QCheckBox::stateChanged,
-            this, &VReadEditTab::customWebZoomChanged);
-    m_webZoomFactorSpin = new QDoubleSpinBox(this);
-    m_webZoomFactorSpin->setMaximum(c_webZoomFactorMax);
-    m_webZoomFactorSpin->setMinimum(c_webZoomFactorMin);
-    m_webZoomFactorSpin->setSingleStep(0.25);
-    QHBoxLayout *zoomFactorLayout = new QHBoxLayout();
-    zoomFactorLayout->addWidget(m_customWebZoom);
-    zoomFactorLayout->addWidget(m_webZoomFactorSpin);
-
-    QFormLayout *readLayout = new QFormLayout();
-    readLayout->addRow(zoomFactorLayout);
-
-    m_readBox->setLayout(readLayout);
-
     QVBoxLayout *mainLayout = new QVBoxLayout();
     mainLayout->addWidget(m_readBox);
     mainLayout->addWidget(m_editBox);
@@ -297,55 +276,14 @@ VReadEditTab::VReadEditTab(QWidget *p_parent)
 
 bool VReadEditTab::loadConfiguration()
 {
-    if (!loadWebZoomFactor()) {
-        return false;
-    }
-
     return true;
 }
 
 bool VReadEditTab::saveConfiguration()
 {
-    if (!saveWebZoomFactor()) {
-        return false;
-    }
-
     return true;
 }
 
-bool VReadEditTab::loadWebZoomFactor()
-{
-    qreal factor = g_config->getWebZoomFactor();
-    bool customFactor = g_config->isCustomWebZoomFactor();
-    if (customFactor) {
-        if (factor < c_webZoomFactorMin || factor > c_webZoomFactorMax) {
-            factor = 1;
-        }
-        m_customWebZoom->setChecked(true);
-        m_webZoomFactorSpin->setValue(factor);
-    } else {
-        m_customWebZoom->setChecked(false);
-        m_webZoomFactorSpin->setValue(factor);
-        m_webZoomFactorSpin->setEnabled(false);
-    }
-    return true;
-}
-
-bool VReadEditTab::saveWebZoomFactor()
-{
-    if (m_customWebZoom->isChecked()) {
-        g_config->setWebZoomFactor(m_webZoomFactorSpin->value());
-    } else {
-        g_config->setWebZoomFactor(-1);
-    }
-    return true;
-}
-
-void VReadEditTab::customWebZoomChanged(int p_state)
-{
-    m_webZoomFactorSpin->setEnabled(p_state == Qt::Checked);
-}
-
 VNoteManagementTab::VNoteManagementTab(QWidget *p_parent)
     : QWidget(p_parent)
 {
@@ -509,15 +447,40 @@ VMarkdownTab::VMarkdownTab(QWidget *p_parent)
     openModeLabel->setToolTip(m_openModeCombo->toolTip());
 
     // Heading sequence.
-    m_headingSequence = new QCheckBox();
+    m_headingSequence = new QCheckBox(tr("Heading sequence"));
     m_headingSequence->setToolTip(tr("Enable auto sequence for all headings (in the form like 1.2.3.4.)"));
 
-    QLabel *headingSequenceLabel = new QLabel(tr("Heading sequence:"));
-    headingSequenceLabel->setToolTip(m_headingSequence->toolTip());
+    // Web Zoom Factor.
+    m_customWebZoom = new QCheckBox(tr("Custom Web zoom factor"), this);
+    m_customWebZoom->setToolTip(tr("Set the zoom factor of the Web page when reading"));
+    connect(m_customWebZoom, &QCheckBox::stateChanged,
+            this, [this](int p_state){
+                this->m_webZoomFactorSpin->setEnabled(p_state == Qt::Checked);
+            });
+
+    m_webZoomFactorSpin = new QDoubleSpinBox(this);
+    m_webZoomFactorSpin->setMaximum(c_webZoomFactorMax);
+    m_webZoomFactorSpin->setMinimum(c_webZoomFactorMin);
+    m_webZoomFactorSpin->setSingleStep(0.25);
+    QHBoxLayout *zoomFactorLayout = new QHBoxLayout();
+    zoomFactorLayout->addWidget(m_customWebZoom);
+    zoomFactorLayout->addWidget(m_webZoomFactorSpin);
+
+    // Color column.
+    m_colorColumnEdit = new QLineEdit();
+    m_colorColumnEdit->setToolTip(tr("Specify the screen column in fenced code block "
+                                     "which will be highlighted"));
+    QValidator *validator = new QRegExpValidator(QRegExp("\\d+"), this);
+    m_colorColumnEdit->setValidator(validator);
+
+    QLabel *colorColumnLabel = new QLabel(tr("Color column:"));
+    colorColumnLabel->setToolTip(m_colorColumnEdit->toolTip());
 
     QFormLayout *mainLayout = new QFormLayout();
     mainLayout->addRow(openModeLabel, m_openModeCombo);
-    mainLayout->addRow(headingSequenceLabel, m_headingSequence);
+    mainLayout->addRow(m_headingSequence);
+    mainLayout->addRow(zoomFactorLayout);
+    mainLayout->addRow(colorColumnLabel, m_colorColumnEdit);
 
     setLayout(mainLayout);
 }
@@ -532,6 +495,14 @@ bool VMarkdownTab::loadConfiguration()
         return false;
     }
 
+    if (!loadWebZoomFactor()) {
+        return false;
+    }
+
+    if (!loadColorColumn()) {
+        return false;
+    }
+
     return true;
 }
 
@@ -545,6 +516,14 @@ bool VMarkdownTab::saveConfiguration()
         return false;
     }
 
+    if (!saveWebZoomFactor()) {
+        return false;
+    }
+
+    if (!saveColorColumn()) {
+        return false;
+    }
+
     return true;
 }
 
@@ -583,3 +562,52 @@ bool VMarkdownTab::saveHeadingSequence()
     g_config->setEnableHeadingSequence(m_headingSequence->isChecked());
     return true;
 }
+
+bool VMarkdownTab::loadWebZoomFactor()
+{
+    qreal factor = g_config->getWebZoomFactor();
+    bool customFactor = g_config->isCustomWebZoomFactor();
+    if (customFactor) {
+        if (factor < c_webZoomFactorMin || factor > c_webZoomFactorMax) {
+            factor = 1;
+        }
+        m_customWebZoom->setChecked(true);
+        m_webZoomFactorSpin->setValue(factor);
+    } else {
+        m_customWebZoom->setChecked(false);
+        m_webZoomFactorSpin->setValue(factor);
+        m_webZoomFactorSpin->setEnabled(false);
+    }
+
+    return true;
+}
+
+bool VMarkdownTab::saveWebZoomFactor()
+{
+    if (m_customWebZoom->isChecked()) {
+        g_config->setWebZoomFactor(m_webZoomFactorSpin->value());
+    } else {
+        g_config->setWebZoomFactor(-1);
+    }
+
+    return true;
+}
+
+bool VMarkdownTab::loadColorColumn()
+{
+    int colorColumn = g_config->getColorColumn();
+    m_colorColumnEdit->setText(QString::number(colorColumn <= 0 ? 0 : colorColumn));
+    return true;
+}
+
+bool VMarkdownTab::saveColorColumn()
+{
+    bool ok = false;
+    int colorColumn = m_colorColumnEdit->text().toInt(&ok);
+    if (ok && colorColumn >= 0) {
+        g_config->setColorColumn(colorColumn);
+    }
+
+    return true;
+}
+
diff --git a/src/dialog/vsettingsdialog.h b/src/dialog/vsettingsdialog.h
index c0ac1bd5..0783e7ba 100644
--- a/src/dialog/vsettingsdialog.h
+++ b/src/dialog/vsettingsdialog.h
@@ -48,17 +48,6 @@ public:
 
     QGroupBox *m_readBox;
     QGroupBox *m_editBox;
-
-    // Web zoom factor.
-    QCheckBox *m_customWebZoom;
-    QDoubleSpinBox *m_webZoomFactorSpin;
-
-private slots:
-    void customWebZoomChanged(int p_state);
-
-private:
-    bool loadWebZoomFactor();
-    bool saveWebZoomFactor();
 };
 
 class VNoteManagementTab : public QWidget
@@ -106,12 +95,25 @@ public:
     // Whether enable heading sequence.
     QCheckBox *m_headingSequence;
 
+    // Web zoom factor.
+    QCheckBox *m_customWebZoom;
+    QDoubleSpinBox *m_webZoomFactorSpin;
+
+    // Color column in code block.
+    QLineEdit *m_colorColumnEdit;
+
 private:
     bool loadOpenMode();
     bool saveOpenMode();
 
     bool loadHeadingSequence();
     bool saveHeadingSequence();
+
+    bool loadWebZoomFactor();
+    bool saveWebZoomFactor();
+
+    bool loadColorColumn();
+    bool saveColorColumn();
 };
 
 class VSettingsDialog : public QDialog
diff --git a/src/hgmarkdownhighlighter.cpp b/src/hgmarkdownhighlighter.cpp
index 298223db..3079e570 100644
--- a/src/hgmarkdownhighlighter.cpp
+++ b/src/hgmarkdownhighlighter.cpp
@@ -48,6 +48,10 @@ HGMarkdownHighlighter::HGMarkdownHighlighter(const QVector<HighlightingStyle> &s
         }
     }
 
+    m_colorColumnFormat = codeBlockFormat;
+    m_colorColumnFormat.setForeground(QColor(g_config->getEditorColorColumnFg()));
+    m_colorColumnFormat.setBackground(QColor(g_config->getEditorColorColumnBg()));
+
     resizeBuffer(initCapacity);
     document = parent;
 
@@ -184,6 +188,8 @@ void HGMarkdownHighlighter::highlightBlock(const QString &text)
         }
     }
 
+    highlightCodeBlockColorColumn(text);
+
 exit:
     highlightChanged();
 }
@@ -402,6 +408,20 @@ void HGMarkdownHighlighter::highlightCodeBlock(const QString &text)
     setFormat(index, length, codeBlockFormat);
 }
 
+void HGMarkdownHighlighter::highlightCodeBlockColorColumn(const QString &p_text)
+{
+    int cc = g_config->getColorColumn();
+    if (cc <= 0 || currentBlockState() != HighlightBlockState::CodeBlock) {
+        return;
+    }
+
+    if (p_text.size() < cc) {
+        return;
+    }
+
+    setFormat(cc - 1, 1, m_colorColumnFormat);
+}
+
 void HGMarkdownHighlighter::highlightLinkWithSpacesInURL(const QString &p_text)
 {
     if (currentBlockState() == HighlightBlockState::CodeBlock) {
diff --git a/src/hgmarkdownhighlighter.h b/src/hgmarkdownhighlighter.h
index 99f6b5dd..53940b65 100644
--- a/src/hgmarkdownhighlighter.h
+++ b/src/hgmarkdownhighlighter.h
@@ -163,6 +163,7 @@ private:
     QTextCharFormat codeBlockFormat;
     QTextCharFormat m_linkFormat;
     QTextCharFormat m_imageFormat;
+    QTextCharFormat m_colorColumnFormat;
 
     QTextDocument *document;
     QVector<HighlightingStyle> highlightingStyles;
@@ -241,6 +242,9 @@ private:
 
     // Set the user data of currentBlock().
     void updateBlockUserData(int p_blockNum, const QString &p_text);
+
+    // Highlight color column in code block.
+    void highlightCodeBlockColorColumn(const QString &p_text);
 };
 
 inline const QMap<int, bool> &HGMarkdownHighlighter::getPotentialPreviewBlocks() const
diff --git a/src/resources/styles/default.mdhl b/src/resources/styles/default.mdhl
index 5a6da914..89387a73 100644
--- a/src/resources/styles/default.mdhl
+++ b/src/resources/styles/default.mdhl
@@ -18,14 +18,17 @@ trailing-space: a8a8a8
 # [VNote] Style for line number
 line-number-background: bdbdbd
 line-number-foreground: 424242
-# [VNote] style for selected word highlight
+# [VNote] Style for selected word highlight
 selected-word-background: dfdf00
-# [VNote] style for searched word highlight
+# [VNote] Style for searched word highlight
 searched-word-background: 4db6ac
-# [VNote] style for searched word under cursor highlight
+# [VNote] Style for searched word under cursor highlight
 searched-word-cursor-background: 66bb6a
-# [VNote] style for incremental searched word highlight
+# [VNote] Style for incremental searched word highlight
 incremental-searched-word-background: ce93d8
+# [VNote] Style for color column in fenced code block
+color-column-background: dd0000
+color-column-foreground: ffff00
 
 editor-selection
 foreground: eeeeee
diff --git a/src/resources/vnote.ini b/src/resources/vnote.ini
index 03e0a214..1a5c98a6 100644
--- a/src/resources/vnote.ini
+++ b/src/resources/vnote.ini
@@ -86,6 +86,10 @@ note_open_mode=0
 ; Whether auto generate heading sequence
 enable_heading_sequence=false
 
+; Style the xth column in fenced code block
+; 0 - no color column
+color_column=0
+
 [session]
 tools_dock_checked=true
 
diff --git a/src/vconfigmanager.cpp b/src/vconfigmanager.cpp
index f88be7ad..3c0b6f5e 100644
--- a/src/vconfigmanager.cpp
+++ b/src/vconfigmanager.cpp
@@ -177,6 +177,8 @@ void VConfigManager::initialize()
 
     m_enableHeadingSequence = getConfigFromSettings("global",
                                                     "enable_heading_sequence").toBool();
+
+    m_colorColumn = getConfigFromSettings("global", "color_column").toInt();
 }
 
 void VConfigManager::readPredefinedColorsFromSettings()
@@ -369,6 +371,8 @@ void VConfigManager::updateMarkdownEditStyle()
     static const QString defaultIncrementalSearchedWordBg = "#CE93D8";
     static const QString defaultLineNumberBg = "#BDBDBD";
     static const QString defaultLineNumberFg = "#424242";
+    static const QString defaultColorColumnBg = "#DD0000";
+    static const QString defaultColorColumnFg = "#FFFF00";
 
     // Read style file .mdhl
     QString file(getEditorStyleUrl());
@@ -431,6 +435,8 @@ void VConfigManager::updateMarkdownEditStyle()
     m_editorIncrementalSearchedWordBg = defaultIncrementalSearchedWordBg;
     m_editorLineNumberBg = defaultLineNumberBg;
     m_editorLineNumberFg = defaultLineNumberFg;
+    m_editorColorColumnBg = defaultColorColumnBg;
+    m_editorColorColumnFg = defaultColorColumnFg;
     auto editorIt = styles.find("editor");
     if (editorIt != styles.end()) {
         auto it = editorIt->find("trailing-space");
@@ -467,6 +473,16 @@ void VConfigManager::updateMarkdownEditStyle()
         if (it != editorIt->end()) {
             m_editorIncrementalSearchedWordBg = "#" + *it;
         }
+
+        it = editorIt->find("color-column-background");
+        if (it != editorIt->end()) {
+            m_editorColorColumnBg = "#" + *it;
+        }
+
+        it = editorIt->find("color-column-foreground");
+        if (it != editorIt->end()) {
+            m_editorColorColumnFg = "#" + *it;
+        }
     }
 }
 
diff --git a/src/vconfigmanager.h b/src/vconfigmanager.h
index 87ebdf01..b333df10 100644
--- a/src/vconfigmanager.h
+++ b/src/vconfigmanager.h
@@ -235,6 +235,12 @@ public:
     bool getEnableHeadingSequence() const;
     void setEnableHeadingSequence(bool p_enabled);
 
+    int getColorColumn() const;
+    void setColorColumn(int p_column);
+
+    const QString &getEditorColorColumnBg() const;
+    const QString &getEditorColorColumnFg() const;
+
     // Return the configured key sequence of @p_operation.
     // Return empty if there is no corresponding config.
     QString getShortcutKeySequence(const QString &p_operation) const;
@@ -475,6 +481,15 @@ private:
     // Whether auto genearte heading sequence.
     bool m_enableHeadingSequence;
 
+    // The column to style in code block.
+    int m_colorColumn;
+
+    // The background color of the color column.
+    QString m_editorColorColumnBg;
+
+    // The foreground color of the color column.
+    QString m_editorColorColumnFg;
+
     // The name of the config file in each directory, obsolete.
     // Use c_dirConfigFile instead.
     static const QString c_obsoleteDirConfigFile;
@@ -1226,4 +1241,29 @@ inline void VConfigManager::setEnableHeadingSequence(bool p_enabled)
                         m_enableHeadingSequence);
 }
 
+inline int VConfigManager::getColorColumn() const
+{
+    return m_colorColumn;
+}
+
+inline void VConfigManager::setColorColumn(int p_column)
+{
+    if (m_colorColumn == p_column) {
+        return;
+    }
+
+    m_colorColumn = p_column;
+    setConfigToSettings("global", "color_column", m_colorColumn);
+}
+
+inline const QString &VConfigManager::getEditorColorColumnBg() const
+{
+    return m_editorColorColumnBg;
+}
+
+inline const QString &VConfigManager::getEditorColorColumnFg() const
+{
+    return m_editorColorColumnFg;
+}
+
 #endif // VCONFIGMANAGER_H
diff --git a/src/vmainwindow.cpp b/src/vmainwindow.cpp
index ba58247d..c20c3046 100644
--- a/src/vmainwindow.cpp
+++ b/src/vmainwindow.cpp
@@ -730,20 +730,35 @@ void VMainWindow::initFileMenu()
 
     fileMenu->addAction(settingsAct);
 
+    QAction *editConfigAct = new QAction(tr("Edit Configuration File"), this);
+    editConfigAct->setToolTip(tr("View and edit configuration file of VNote (vnote.ini)"));
+    connect(editConfigAct, &QAction::triggered,
+            this, [this](){
+#if defined(Q_OS_MACOS) || defined(Q_OS_MAC)
+                // On macOS, it seems that we could not open that ini file directly.
+                QUrl url = QUrl::fromLocalFile(g_config->getConfigFolder());
+#else
+                QUrl url = QUrl::fromLocalFile(g_config->getConfigFilePath());
+#endif
+                QDesktopServices::openUrl(url);
+            });
+
+    fileMenu->addAction(editConfigAct);
+
     QAction *customShortcutAct = new QAction(tr("Custom Shortcuts"), this);
     customShortcutAct->setToolTip(tr("Custom some standard shortcuts"));
     connect(customShortcutAct, &QAction::triggered,
             this, [this](){
                 int ret = VUtils::showMessage(QMessageBox::Information,
-                              tr("Custom Shortcuts"),
-                              tr("VNote supports customing some standard shorcuts by "
-                                 "editing user's configuration file (vnote.ini). Please "
-                                 "reference the shortcuts help documentation for more "
-                                 "information."),
-                              tr("Click \"OK\" to custom shortcuts."),
-                              QMessageBox::Ok | QMessageBox::Cancel,
-                              QMessageBox::Ok,
-                              this);
+                                              tr("Custom Shortcuts"),
+                                              tr("VNote supports customing some standard shorcuts by "
+                                                 "editing user's configuration file (vnote.ini). Please "
+                                                 "reference the shortcuts help documentation for more "
+                                                 "information."),
+                                              tr("Click \"OK\" to custom shortcuts."),
+                                              QMessageBox::Ok | QMessageBox::Cancel,
+                                              QMessageBox::Ok,
+                                              this);
 
                 if (ret == QMessageBox::Ok) {
 #if defined(Q_OS_MACOS) || defined(Q_OS_MAC)
diff --git a/src/vmdedit.cpp b/src/vmdedit.cpp
index 9970a89a..e0f1b989 100644
--- a/src/vmdedit.cpp
+++ b/src/vmdedit.cpp
@@ -355,7 +355,7 @@ static QString headerSequenceStr(const QVector<int> &p_sequence)
     return res;
 }
 
-static void insertSequenceToHeader(QTextBlock &p_block,
+static void insertSequenceToHeader(QTextBlock p_block,
                                    QRegExp &p_reg,
                                    QRegExp &p_preReg,
                                    const QString &p_seq)
diff --git a/src/vstyleparser.cpp b/src/vstyleparser.cpp
index c15c40fb..5dce82f9 100644
--- a/src/vstyleparser.cpp
+++ b/src/vstyleparser.cpp
@@ -234,7 +234,8 @@ void VStyleParser::fetchMarkdownEditorStyles(QPalette &palette, QFont &font,
         }
 
         // Get custom styles:
-        //     trailing-space, line-number-background, line-number-foreground
+        //     trailing-space, line-number-background, line-number-foreground,
+        //     color-column-background, color-column-foreground
         case pmh_attr_type_other:
         {
             QString attrName(editorStyles->name);