travelify sub menu disappears

Hi

I love the theme and everything almost ready to go live - I added a submenu item but when you mouse over it, it disappears. I have read and implemented some of the recommendations - but nothing has worked. I would really appreciate help so I can continue using this theme.
www. mckenziedental.ca

thank you in advance

Hey there,

I hope you are well today and thank you for your question.

You can try achieving this by adding the following CSS code in the Custom CSS option of your theme on the below path.

Admin Area -> Appearance -> Customize -> Additional CSS

/*sub menu color hover*/
#main-nav ul li ul li a:hover{
  color:black;
}

Best regards,
Support.