How to remove white space in submenu?

hi,
my question is how to remove white space between submenu. as you can see in screen shot http://prntscr.com/kn49jn

Hello there,

Try adding this CSS code to Appearance > Customize > Additional CSS from dashboard.

    #mainnav .sub-menu li a {
      line-height: 18px;
    }

Regards,
Kharis