18F/18f.gsa.gov

/*
========================================
opacity
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usage:
  .opacity-[key]
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output:
  opacity: [value];
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example:
  .opacity-0 {
    opacity: 0; }
----------------------------------------
*/

$u-opacity: (
  opacity: (
    base: (
      "opacity"
    ),
    modifiers: null,
    values: map-collect(get-palettes($opacity-palettes), $opacity-manual-values),
    settings: $opacity-settings,
    property: "opacity",
    type: "utility"
  )
);