$max: 2147483647;
$tooltip: 1070;
$popover: 1060;
$modal: 1040;
$fixed: 1030;
$main-menu-content: 1030;
$main-menu-backdrop: 1029;
$notification: 1020;
$snackbar: 1010;
$navbar-button: 1005;
$contextmenu: 1005;
$navbar: 1000;
$dropdown: 1000;
$dropdown-backdrop: 990;
$safety-line: 51;
$overlay: 50;
$dashboard: 49;
$hud: 10;
$optional-content: 5;
$search-icon: 2;