#6B758B

CSS

:root {
  --abandoned-spaceship: #6b758b;
  --abandoned-spaceship-rgb: 107 117 139;
  --abandoned-spaceship-oklch: oklch(0.562 0.036 265.9);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(221 13% 48%);
  border-color: oklch(0.562 0.036 265.9);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #6b758b;
  --color-abandoned-spaceship-50: #f1f5ff;
  --color-abandoned-spaceship-100: #e3e8f4;
  --color-abandoned-spaceship-200: #cdd4e4;
  --color-abandoned-spaceship-300: #afb7cb;
  --color-abandoned-spaceship-400: #949eb5;
  --color-abandoned-spaceship-500: #7b869f;
  --color-abandoned-spaceship-600: #687286;
  --color-abandoned-spaceship-700: #535b6c;
  --color-abandoned-spaceship-800: #3c424f;
  --color-abandoned-spaceship-900: #292e37;
  --color-abandoned-spaceship-950: #171b22;
}

SCSS

$abandoned-spaceship: #6b758b;
$abandoned-spaceship-rgb: 107, 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);
}