Css generated for h tags

Hi,

I see that in the article generated the h2 in my case use this css:

Where I can see that id and change something?

Thanks

<h2 id="wpaicg-como-una-pagina-web-puede-ayudar-a-mejorar-la-comunicacion-con-tus-clientes"

The page I need help with: [log in to see the link]