#727688

CSS

:root {
  --abandoned-spaceship: #727688;
  --abandoned-spaceship-rgb: 114 118 136;
  --abandoned-spaceship-oklch: oklch(0.569 0.028 275.6);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(229 9% 49%);
  border-color: oklch(0.569 0.028 275.6);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #727688;
  --color-abandoned-spaceship-50: #f3f5fd;
  --color-abandoned-spaceship-100: #e5e7f1;
  --color-abandoned-spaceship-200: #d1d3e1;
  --color-abandoned-spaceship-300: #b3b6c6;
  --color-abandoned-spaceship-400: #999daf;
  --color-abandoned-spaceship-500: #818599;
  --color-abandoned-spaceship-600: #6d7182;
  --color-abandoned-spaceship-700: #575a68;
  --color-abandoned-spaceship-800: #3f424c;
  --color-abandoned-spaceship-900: #2b2d35;
  --color-abandoned-spaceship-950: #191a20;
}

SCSS

$abandoned-spaceship: #727688;
$abandoned-spaceship-rgb: 114, 118, 136;
$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);
}