message: fix(Masthead): search icon z-index
diff: &--actions {
  position: absolute;
  - z-index: 10001;
  top: 0;
  right: 0;
  }
  z-index: 999;
  width: 100%;
  + .#{$prefix}--header__search--actions {
  + z-index: 10001;
  + }
  +
  .react-autosuggest__container {
  &::after {
  content: '';
  