#6A758B

CSS

:root {
  --abandoned-spaceship: #6a758b;
  --abandoned-spaceship-rgb: 106 117 139;
  --abandoned-spaceship-oklch: oklch(0.561 0.037 264.2);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(220 13% 48%);
  border-color: oklch(0.561 0.037 264.2);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #6a758b;
  --color-abandoned-spaceship-50: #f0f5ff;
  --color-abandoned-spaceship-100: #e2e8f5;
  --color-abandoned-spaceship-200: #cdd4e5;
  --color-abandoned-spaceship-300: #afb7cb;
  --color-abandoned-spaceship-400: #949fb5;
  --color-abandoned-spaceship-500: #7a869f;
  --color-abandoned-spaceship-600: #677287;
  --color-abandoned-spaceship-700: #535b6c;
  --color-abandoned-spaceship-800: #3c434f;
  --color-abandoned-spaceship-900: #292e37;
  --color-abandoned-spaceship-950: #171b22;
}

SCSS

$abandoned-spaceship: #6a758b;
$abandoned-spaceship-rgb: 106, 117, 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);
}