#777677

CSS

:root {
  --lucky-grey: #777677;
  --lucky-grey-rgb: 119 118 119;
  --lucky-grey-oklch: oklch(0.567 0.002 325.6);
}

.element {
  color: var(--lucky-grey);
  background-color: hsl(300 0% 46%);
  border-color: oklch(0.567 0.002 325.6);
}

Tailwind CSS v4

@theme {
  --color-lucky-grey: #777677;
  --color-lucky-grey-50: #f5f5f5;
  --color-lucky-grey-100: #e8e7e8;
  --color-lucky-grey-200: #d5d4d4;
  --color-lucky-grey-300: #b8b7b8;
  --color-lucky-grey-400: #9f9e9f;
  --color-lucky-grey-500: #878687;
  --color-lucky-grey-600: #727172;
  --color-lucky-grey-700: #5b5a5b;
  --color-lucky-grey-800: #434243;
  --color-lucky-grey-900: #2e2e2e;
  --color-lucky-grey-950: #1b1a1b;
}

SCSS

$lucky-grey: #777677;
$lucky-grey-rgb: 119, 118, 119;
$lucky-grey-light: mix(#fff, $lucky-grey, 20%);
$lucky-grey-dark: mix(#000, $lucky-grey, 20%);

.element {
  color: $lucky-grey;
  box-shadow: 0 0 0 2px rgba($lucky-grey, 0.35);
}