diff --git a/bin/app/data/gui/code_view/code_view.css b/bin/app/data/gui/code_view/code_view.css
index 8a98266e..c6921c77 100644
--- a/bin/app/data/gui/code_view/code_view.css
+++ b/bin/app/data/gui/code_view/code_view.css
@@ -130,9 +130,3 @@
 #code_file #minimize_button:enabled {
 	border-image: url(data/gui/code_view/images/minimize_active.png);
 }
-
-QToolTip {
-	background-color: #E0E0E0;
-	color: black;
-	font-size: <setting:font_size>pt;
-}
diff --git a/bin/app/data/gui/graph_view/graph_view.css b/bin/app/data/gui/graph_view/graph_view.css
index 79c2d608..55bd26f3 100644
--- a/bin/app/data/gui/graph_view/graph_view.css
+++ b/bin/app/data/gui/graph_view/graph_view.css
@@ -1,9 +1,3 @@
 QGraphicsView, QGraphicsScene {
 	background-color: <color:graph/background>;
 }
-
-QToolTip {
-	background-color: #E0E0E0;
-	color: black;
-	font-size: <setting:font_size>pt;
-}
diff --git a/bin/app/data/gui/refresh_view/refresh_view.css b/bin/app/data/gui/refresh_view/refresh_view.css
index ac0fe029..64f46b7d 100644
--- a/bin/app/data/gui/refresh_view/refresh_view.css
+++ b/bin/app/data/gui/refresh_view/refresh_view.css
@@ -27,9 +27,3 @@ QPushButton:pressed {
 	border-bottom-right-radius: 12px;
 	border-top-right-radius: 12px;
 }
-
-QToolTip {
-	background-color: #E0E0E0;
-	color: black;
-	font-size: <setting:font_size>pt;
-}
diff --git a/bin/app/data/gui/search_view/search_view.css b/bin/app/data/gui/search_view/search_view.css
index fec963b7..f892dbaa 100644
--- a/bin/app/data/gui/search_view/search_view.css
+++ b/bin/app/data/gui/search_view/search_view.css
@@ -57,9 +57,3 @@ QPushButton#search_button {
 #search_button:pressed {
 	background: <color:search/button/press>;
 }
-
-QToolTip {
-	background-color: #E0E0E0;
-	color: black;
-	font-size: <setting:font_size>pt;
-}
diff --git a/bin/app/data/gui/setting_window/window.css b/bin/app/data/gui/setting_window/window.css
index f6e91bb9..75c5bc12 100644
--- a/bin/app/data/gui/setting_window/window.css
+++ b/bin/app/data/gui/setting_window/window.css
@@ -75,9 +75,3 @@ QLineEdit:disabled {
 	color: white;
 	background: #2D3F85;
 }
-
-QToolTip {
-	background-color: #E0E0E0;
-	color: black;
-	font-size: <setting:font_size>pt;
-}
diff --git a/bin/app/data/gui/undoredo_view/undoredo_view.css b/bin/app/data/gui/undoredo_view/undoredo_view.css
index bb7b3c62..90e8178b 100644
--- a/bin/app/data/gui/undoredo_view/undoredo_view.css
+++ b/bin/app/data/gui/undoredo_view/undoredo_view.css
@@ -32,9 +32,3 @@ QPushButton:hover {
 QPushButton:pressed {
 	background: <color:search/button/press>;
 }
-
-QToolTip {
-	background-color: #E0E0E0;
-	color: black;
-	font-size: <setting:font_size>pt;
-}
diff --git a/bin/app/data/projects/tictactoe/src/field.h b/bin/app/data/projects/tictactoe/src/field.h
index a4d95f5f..ef3201e8 100644
--- a/bin/app/data/projects/tictactoe/src/field.h
+++ b/bin/app/data/projects/tictactoe/src/field.h
@@ -9,7 +9,7 @@ public:
 		PlayerB = 4
 	};
 
-	static Token Opponent( oken token );
+	static Token Opponent( Token token );
 
 	struct Move {
 		int row;
diff --git a/src/lib_gui/qt/window/QtMainWindow.cpp b/src/lib_gui/qt/window/QtMainWindow.cpp
index 586958d5..5881b7c9 100644
--- a/src/lib_gui/qt/window/QtMainWindow.cpp
+++ b/src/lib_gui/qt/window/QtMainWindow.cpp
@@ -10,6 +10,7 @@
 
 #include "component/view/View.h"
 #include "component/view/CompositeView.h"
+#include "qt/utility/utilityQt.h"
 #include "qt/view/QtViewWidgetWrapper.h"
 #include "settings/ApplicationSettings.h"
 #include "utility/file/FileSystem.h"
@@ -92,6 +93,8 @@ QtMainWindow::QtMainWindow()
 	QApplication* app = dynamic_cast<QApplication*>(QCoreApplication::instance());
 	app->installEventFilter(new MouseReleaseFilter(this));
 
+	app->setStyleSheet(utility::getStyleSheet("data/gui/tooltip.css").c_str());
+
 	m_recentProjectAction = new QAction*[ApplicationSettings::MaximalAmountOfRecentProjects];
 
 	setupProjectMenu();