@primer/view-components/app/components/primer/alpha/overlay.css.json

ViewComponents for the Primer Design System

{
  "name": "alpha/overlay",
  "selectors": [
    "anchored-position[popover]",
    "anchored-position:not(.Overlay)",
    ".Overlay[popover]:not(:popover-open)",
    "anchored-position.not-anchored::backdrop",
    "dialog::backdrop",
    "select-panel dialog::backdrop",
    ".Overlay"
  ]
}