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$header-zindex: (
        modal     : 9000,
        overlay   : 8000,
        dropdown  : 7000,
        breadcrumb    : 6000
);

$body-zindex: (
        modal     : 9000,
        overlay   : 8000,
        dropdown  : 7000,
        browserhistory    : 5000
);

.test-header {
  z-index: map-get($header-zindex, overlay);
}

.test-browserhistory {
  z-index: map-get($body-zindex, browserhistory);
}