css files can be loaded from file

mainwindow.cpp

@@ -53,6 +53,7 @@
 
 MainWindow* mainWindow;
 
+#define DEFAULT_CSS "QPushButton::checked { background: rgb(25, 25, 25); }"
 #define OLIVE_FILE_FILTER "Olive Project (*.ove)"
 
 QTimer autorecovery_timer;
@@ -106,7 +107,7 @@ MainWindow::MainWindow(QWidget *parent, const QString &an) :
 	// set up style?
 
 	qApp->setStyle(QStyleFactory::create("Fusion"));
-	setStyleSheet("QPushButton::checked { background: rgb(25, 25, 25); }");
+    setStyleSheet(DEFAULT_CSS);
 
 	QPalette darkPalette;
 	darkPalette.setColor(QPalette::Window, QColor(53,53,53));
@@ -197,7 +198,11 @@ MainWindow::MainWindow(QWidget *parent, const QString &an) :
 		config_fn = config_path + "/config.xml";
 		if (QFileInfo::exists(config_fn)) {
 			config.load(config_fn);
-		}
+
+            if (!config.css_path.isEmpty()) {
+                load_css_from_file(config.css_path);
+            }
+        }
 	}
 
 	alloc_panels(this);
@@ -330,7 +335,18 @@ void MainWindow::save_shortcuts(const QString& fn) {
 		shortcut_file_io.close();
 	} else {
 		qCritical() << "Failed to save shortcut file";
-	}
+    }
+}
+
+void MainWindow::load_css_from_file(const QString &fn) {
+    QFile css_file(fn);
+    if (css_file.exists() && css_file.open(QFile::ReadOnly)) {
+        setStyleSheet(css_file.readAll());
+        css_file.close();
+    } else {
+        // set default stylesheet
+        setStyleSheet(DEFAULT_CSS);
+    }
 }
 
 void MainWindow::show_about() {