Sydney problems after update | WordPress.org

Good afternoon. I just updated my Sydney website and now on a PC the hamburger menu doesn’t work and on a mobile device the gallery now is superimposed on the page covering most of it. I followed this link and made the changes but no difference https://wordpress.org/support/topic/hamburger-menu-still-not-working-after-update/

Thank you in advance

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