Main Menu & Child Theme

Hello,

I uses your great free theme for my website https://www.markotop.com

But I have 2 issues:

1. The Main Menu is black, only if I hover my mouse, the menu will be appear White. On your Demo, the Main Menu always on white.

2. I tried to create Child Theme, but always got error.

Please help me.

Thank you.

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