diff --git a/src/resources/themes/v_white/v_white.palette b/src/resources/themes/v_white/v_white.palette
index 7fb3890e..1ca8f9f1 100644
--- a/src/resources/themes/v_white/v_white.palette
+++ b/src/resources/themes/v_white/v_white.palette
@@ -43,6 +43,11 @@ content_bg=#FFFFFF
 selection_fg=#000000
 selection_bg=#64b5f6
 
+[soft_defined]
+; VAvatar.
+; The border background color of the avatar when Captain mode is triggered.
+avatar_captain_mode_border_bg=#6C6C6C
+
 [widgets]
 ; Widget color attributes.
 
diff --git a/src/vcaptain.cpp b/src/vcaptain.cpp
index fe01d6df..916d5e21 100644
--- a/src/vcaptain.cpp
+++ b/src/vcaptain.cpp
@@ -199,7 +199,7 @@ void VCaptain::exitCaptainMode()
 
     restoreFocus();
 
-    qDebug() << "exit Captain mode";
+    emit captainModeChanged(false);
 }
 
 bool VCaptain::registerCaptainTarget(const QString &p_name,
@@ -255,14 +255,14 @@ bool VCaptain::navigationModeByCaptain(void *p_target, void *p_data)
 
 void VCaptain::triggerCaptainMode()
 {
-    qDebug() << "trigger Captain mode";
-
     m_widgetBeforeCaptain = QApplication::focusWidget();
 
     m_ignoreFocusChange = false;
 
     setMode(CaptainMode::Pending);
 
+    emit captainModeChanged(true);
+
     // Focus to listen pending key press.
     setFocus();
 }
diff --git a/src/vcaptain.h b/src/vcaptain.h
index 73e82282..15d4670f 100644
--- a/src/vcaptain.h
+++ b/src/vcaptain.h
@@ -43,6 +43,10 @@ public:
                                void *p_target,
                                CaptainFunc p_func);
 
+signals:
+    // Emit when mode changed.
+    void captainModeChanged(bool p_captainMode);
+
 protected:
     void keyPressEvent(QKeyEvent *p_event) Q_DECL_OVERRIDE;
 
diff --git a/src/vmainwindow.cpp b/src/vmainwindow.cpp
index 7dff73ce..5a92c0bd 100644
--- a/src/vmainwindow.cpp
+++ b/src/vmainwindow.cpp
@@ -33,11 +33,14 @@
 #include "vsnippetlist.h"
 #include "vtoolbox.h"
 #include "vbuttonmenuitem.h"
+#include "vpalette.h"
 
 VMainWindow *g_mainWin;
 
 extern VConfigManager *g_config;
 
+extern VPalette *g_palette;
+
 VNote *g_vnote;
 
 const int VMainWindow::c_sharedMemTimerInterval = 1000;
@@ -110,6 +113,17 @@ void VMainWindow::initCaptain()
     // VCaptain should be visible to accpet key focus. But VCaptain
     // may hide other widgets.
     m_captain = new VCaptain(this);
+    connect(m_captain, &VCaptain::captainModeChanged,
+            this, [this](bool p_captainMode) {
+                static QString normalBaseColor = m_avatar->getBaseColor();
+                static QString captainModeColor = g_palette->color("avatar_captain_mode_border_bg");
+
+                if (p_captainMode) {
+                    m_avatar->updateBaseColor(captainModeColor);
+                } else {
+                    m_avatar->updateBaseColor(normalBaseColor);
+                }
+            });
 }
 
 void VMainWindow::registerCaptainAndNavigationTargets()
diff --git a/src/vpalette.cpp b/src/vpalette.cpp
index 13730c8f..69995c62 100644
--- a/src/vpalette.cpp
+++ b/src/vpalette.cpp
@@ -20,6 +20,7 @@ void VPalette::init(const QString &p_file)
     QSettings settings(p_file, QSettings::IniFormat);
     initMetaData(&settings, "metadata");
     initPaleteFromSettings(&settings, "phony");
+    initPaleteFromSettings(&settings, "soft_defined");
     initPaleteFromSettings(&settings, "widgets");
 }