$fui-layers: (
  content: 0,
  select-box: 2,
  datagrid-header: 500,
  datagrid-host: 590,
  datagrid-popover: 595,
  column-switch: 600,
  dropdown-menu: $zindex-dropdown,
  alert: 1033,
  sidepanel-bg: 1038,
  sidepanel: 1039,
  modal-bg: 1040,
  modal: 1050,
  tooltips: $zindex-tooltip,
  draggable-ghost: 2147483647 // maximum possible value for z-index across all browsers,
) !default;