#6D778A

CSS

:root {
  --abandoned-spaceship: #6d778a;
  --abandoned-spaceship-rgb: 109 119 138;
  --abandoned-spaceship-oklch: oklch(0.568 0.032 263.3);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(219 12% 48%);
  border-color: oklch(0.568 0.032 263.3);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #6d778a;
  --color-abandoned-spaceship-50: #f1f5ff;
  --color-abandoned-spaceship-100: #e3e8f3;
  --color-abandoned-spaceship-200: #ced4e2;
  --color-abandoned-spaceship-300: #b0b7c8;
  --color-abandoned-spaceship-400: #959fb2;
  --color-abandoned-spaceship-500: #7b869c;
  --color-abandoned-spaceship-600: #687284;
  --color-abandoned-spaceship-700: #535b6a;
  --color-abandoned-spaceship-800: #3c434e;
  --color-abandoned-spaceship-900: #292e36;
  --color-abandoned-spaceship-950: #171b21;
}

SCSS

$abandoned-spaceship: #6d778a;
$abandoned-spaceship-rgb: 109, 119, 138;
$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);
}