Forgot to set the position on rectangle so just added the center helper.

src/guecs/sfml/components.cpp

@@ -97,6 +97,8 @@ namespace guecs {
     shape->setFillColor(color);
     shape->setOutlineColor(border_color);
     shape->setOutlineThickness(border_px);
+
+    sfml_center_helper(shape, cell, padding);
   }
 
   void Rectangle::render(sf::RenderWindow& window, sf::Shader *shader_ptr) {