diff --git a/bottombuttongroup.cpp b/bottombuttongroup.cpp
index 49e6584..c57f7e3 100644
--- a/bottombuttongroup.cpp
+++ b/bottombuttongroup.cpp
@@ -36,7 +36,9 @@ BottomButtonGroup::BottomButtonGroup(QWidget *parent)
     addButton(newBtn("zoom-original", [this]() {
         emit resetToOriginalBtnClicked();
     }));
-    addButton(newBtn("view-fullscreen", [](){qDebug()<< "TODO: view-fullscreen";}));
+    addButton(newBtn("view-fullscreen", [this]() {
+        emit toggleWindowMaximum();
+    }));
     addButton(newBtn("zoom-in", [this]() {
         emit zoomInBtnClicked();
     }));
diff --git a/bottombuttongroup.h b/bottombuttongroup.h
index e338f5c..1284959 100644
--- a/bottombuttongroup.h
+++ b/bottombuttongroup.h
@@ -14,6 +14,7 @@ public:
 
 signals:
     void resetToOriginalBtnClicked();
+    void toggleWindowMaximum();
     void zoomInBtnClicked();
     void zoomOutBtnClicked();
     void toggleCheckerboardBtnClicked();
diff --git a/graphicsview.cpp b/graphicsview.cpp
index e88871b..b8c6629 100644
--- a/graphicsview.cpp
+++ b/graphicsview.cpp
@@ -193,6 +193,8 @@ void GraphicsView::resizeEvent(QResizeEvent *event)
         } else {
             fitInView(sceneRect(), Qt::KeepAspectRatio);
         }
+    } else {
+        emit navigatorViewRequired(!isThingSmallerThanWindowWith(transform()), m_rotateAngle);
     }
     return QGraphicsView::resizeEvent(event);
 }
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 4c1f9b4..4a3e0c1 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -46,7 +46,7 @@ MainWindow::MainWindow(QWidget *parent) :
     this->setCentralWidget(m_graphicsView);
 
     m_gv = new NavigatorView(this);
-    m_gv->setFixedSize(250, 160);
+    m_gv->setFixedSize(220, 160);
     m_gv->setScene(scene);
     m_gv->setMainView(m_graphicsView);
     m_gv->fitInView(m_gv->sceneRect(), Qt::KeepAspectRatio);
@@ -79,6 +79,14 @@ MainWindow::MainWindow(QWidget *parent) :
 
     connect(m_bottomButtonGroup, &BottomButtonGroup::resetToOriginalBtnClicked,
             this, [ = ](){ m_graphicsView->resetScale(); });
+    connect(m_bottomButtonGroup, &BottomButtonGroup::toggleWindowMaximum,
+            this, [ = ](){
+        if (isMaximized()) {
+            showNormal();
+        } else {
+            showMaximized();
+        }
+    });
     connect(m_bottomButtonGroup, &BottomButtonGroup::zoomInBtnClicked,
             this, [ = ](){ m_graphicsView->zoomView(1.25); });
     connect(m_bottomButtonGroup, &BottomButtonGroup::zoomOutBtnClicked,
diff --git a/navigatorview.cpp b/navigatorview.cpp
index fa8e51f..c02dee8 100644
--- a/navigatorview.cpp
+++ b/navigatorview.cpp
@@ -11,7 +11,7 @@ NavigatorView::NavigatorView(QWidget *parent)
 {
     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    setStyleSheet("background-color: rgba(0, 0, 0, 220);"
+    setStyleSheet("background-color: rgba(0, 0, 0, 120);"
                   "border-radius: 3px;");
 }
 
@@ -34,6 +34,7 @@ void NavigatorView::mousePressEvent(QMouseEvent *event)
 
     if (m_mainView) {
         m_mainView->centerOn(mapToScene(event->pos()));
+        update();
     }
 
     return QGraphicsView::mousePressEvent(event);
@@ -43,6 +44,7 @@ void NavigatorView::mouseMoveEvent(QMouseEvent *event)
 {
     if (m_mouseDown && m_mainView) {
         m_mainView->centerOn(mapToScene(event->pos()));
+        update();
     }
 
     return QGraphicsView::mouseMoveEvent(event);