#6A778B

CSS

:root {
  --abandoned-spaceship: #6a778b;
  --abandoned-spaceship-rgb: 106 119 139;
  --abandoned-spaceship-oklch: oklch(0.566 0.035 258.9);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(216 13% 48%);
  border-color: oklch(0.566 0.035 258.9);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #6a778b;
  --color-abandoned-spaceship-50: #f0f5ff;
  --color-abandoned-spaceship-100: #e1e8f4;
  --color-abandoned-spaceship-200: #ccd5e4;
  --color-abandoned-spaceship-300: #adb8ca;
  --color-abandoned-spaceship-400: #929fb3;
  --color-abandoned-spaceship-500: #79879e;
  --color-abandoned-spaceship-600: #667285;
  --color-abandoned-spaceship-700: #525b6b;
  --color-abandoned-spaceship-800: #3b434f;
  --color-abandoned-spaceship-900: #282e37;
  --color-abandoned-spaceship-950: #161b22;
}

SCSS

$abandoned-spaceship: #6a778b;
$abandoned-spaceship-rgb: 106, 119, 139;
$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);
}