.site-header {
  background: #000;
  box-shadow: 0 0 0 100vmax #000;
  clip-path: inset(0 -100vmax);
}
.site-header .site-description,
.site-header .site-navigation ul.menu li a {
  color: #fff;
}
.site-header .site-navigation ul.menu li a:hover,
.site-header .site-navigation ul.menu li.current-menu-item > a {
  color: #bbb;
}