Problem with Vertical Menu

Hello,

I have a theme with a top and bottom horizontal menu. No problem.

But in the case of the vertical menu, it is cropped. I already tried the solution shown above but it does not work in my case.

Check url: https://negocios.com.ni/websealnic/sellado-dinamico/

Check image: https://negocios.com.ni/websealnic/archivos/menu.png

Any ideas?

Very Thanks