a:hover {
  font-size: 40px;
  color: #000000; /* черный */
}

#header [data-items] {
  font-size: 0px;
  color: #000000;
}

#header [data-row] {
  font-size: 0px;
  color: #000000;
  /* background-color убрал, т.к. пусто */
  background-image: url("https://4kwallpapers.com/images/wallpapers/illuminated-luxury-white-background-3d-background-sci-fi-3440x1440-7652.jpg");
}

.site-title {
  font-size: 34px;
  color: #000000;
}

nav[class*=menu] li:hover > .ct-menu-link {
  color: #FFD700; /* жёлтый при наведении */
  font-size: 14px;
  font-family: 'Shadows Into Light', cursive;
}