Hi Amit
Please add the below CSS code in the Additional CSS box.
.header-fixed-top .navbar .nav .menu-item:hover .nav-link, .navbar.navbar-header-wrap .nav .menu-item:focus .nav-link, .navbar.navbar-header-wrap.header-fixed-top .nav .menu-item:hover .nav-link, .navbar.navbar-header-wrap.header-fixed-top .nav .menu-item:focus .nav-link {
color: #000;
}
Let us know if it works.
Thanks