Hi Ed,
I am sorry for the delay. It is better if I show you the site. I made a hack for you to access:
http://www.nilssonhobeich.com/index.php?prueba=ok
There, if you shrink the window, you will notice that tab menu doesn’t change in a responsive way and it gets cut.
Also, the item menu ‘casos’ opens in a different URL instead going to this section in the same page. I can’t understand why.
Thanks