#737681

CSS

:root {
  --abandoned-spaceship: #737681;
  --abandoned-spaceship-rgb: 115 118 129;
  --abandoned-spaceship-oklch: oklch(0.567 0.017 273.7);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(227 6% 48%);
  border-color: oklch(0.567 0.017 273.7);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #737681;
  --color-abandoned-spaceship-50: #f3f5fa;
  --color-abandoned-spaceship-100: #e6e7ee;
  --color-abandoned-spaceship-200: #d2d4dc;
  --color-abandoned-spaceship-300: #b5b7c0;
  --color-abandoned-spaceship-400: #9b9ea9;
  --color-abandoned-spaceship-500: #828692;
  --color-abandoned-spaceship-600: #6e717b;
  --color-abandoned-spaceship-700: #585a63;
  --color-abandoned-spaceship-800: #404249;
  --color-abandoned-spaceship-900: #2c2e32;
  --color-abandoned-spaceship-950: #191a1e;
}

SCSS

$abandoned-spaceship: #737681;
$abandoned-spaceship-rgb: 115, 118, 129;
$abandoned-spaceship-light: mix(#fff, $abandoned-spaceship, 20%);
$abandoned-spaceship-dark: mix(#000, $abandoned-spaceship, 20%);

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