@charleshood : Login to your WordPress admin section. Go to Appearance => Customize => Additional css and add the following css.
@media screen and (min-width: 75em) {
.navigation-classic.absolute-header .main-navigation a,
.navigation-classic.absolute-header .main-navigation ul :hover > a,
.navigation-classic.absolute-header .main-navigation ul .focus > a,
.navigation-classic.absolute-header .main-navigation .menu > .current-menu-item > a,
.navigation-classic.absolute-header .main-navigation .menu > .current-menu-ancestor > a,
.navigation-classic.absolute-header .dropdown-toggle {
color: #000000;
}
}
.absolute-header .menu-toggle,
.absolute-header .menu-toggle:hover,
.absolute-header .menu-toggle:focus {
color:#000000;
}
Let me know if this helps you out.
Regards,
Tikaram