Fix Material theme

app/main.cpp

@@ -1,6 +1,7 @@
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
 #include <QIcon>
+#include <QQuickStyle>
 
 // Don't let SDL hook our main function, since Qt is already
 // doing the same thing. This needs to be before any headers
@@ -45,6 +46,8 @@ int main(int argc, char *argv[])
                                                   return new ComputerManager();
                                               });
 
+    QQuickStyle::setStyle("Material");
+
     // Load the main.qml file
     QQmlApplicationEngine engine;
     engine.load(QUrl(QStringLiteral("qrc:/gui/main.qml")));