Mobile menu not visible.

Site URL: https://www.adventuresinaneroid.com/

Hi there,

I am not a coder AT ALL and I'm pretty new to this stuff.  Anyhow, my mobile drop down menu doesn't show my buttons.  They are there and you can click things, but they aren't visible.  I have tried changing backgrounds and colors etc.  Nothing works.  

Please help! 

And speak to me like I'm a child because I do NOT understand coding stuff! Lol.  

Attached is a screenshot of what my menu looks like.  

This CSS from Custom CSS box caused problem

.header-menu .header-menu-nav a:not(.btn) {
    color: #fff;
}

add this to Design > Custom CSS

div.header-menu-nav-item a {
    color: black !important;
}