.navigation--sticked {
  position: sticky;
  top: 0px;
  z-index: var(--navigation-sticked-z-index, 10);
}

.navigation--sticked {
  position: sticky;
  top: 0px;
}

Remove z-index:10 declaration that trumped z-index:10000000 declaration
fix: Remove z-index:10 declaration that trumped z-index:10000000 declaration
