Nav showing white on rounded corners instead of blending

Hi there,

I have a client using this theme, and well, frankly I screwed something up lol. I don’t know what I did but in trying to adjust the header area (which I later accomplished in the bootstrap.css), I caused the nav menu that should have rounded corners to show white on those corners. I was making changes in the style.css at the time. Please see here-
https://cherryxoxo.com/

I have tried to fix it but no luck. Can anyone help me out?

Thanks!