Parallax image background to article

Hello ,

I installed the Capulus theme and very happy with that ,

Now i want to ask a question , how can i add a background image to the article with Parallax bg like mainpage , i replaced and added the code to the article but bg image seems height very low,

Can you help me with that ?

Site address : urper.com/kahvesarayi/kahvenin-tarihi this is the article

Hi,
Thank for choosing our product!
Background on the homepage using the module "Slider Revolution Top", you can into this module and gán for category your desired .
Background to the article, it is lower and it was a photograph, not slide, you can create custom html module and assigned in category

Best regard,
Tinh