#68758A

CSS

:root {
  --abandoned-spaceship: #68758a;
  --abandoned-spaceship-rgb: 104 117 138;
  --abandoned-spaceship-oklch: oklch(0.559 0.036 260);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(217 14% 47%);
  border-color: oklch(0.559 0.036 260);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #68758a;
  --color-abandoned-spaceship-50: #eff5ff;
  --color-abandoned-spaceship-100: #e1e8f4;
  --color-abandoned-spaceship-200: #ccd5e4;
  --color-abandoned-spaceship-300: #adb8cb;
  --color-abandoned-spaceship-400: #929fb4;
  --color-abandoned-spaceship-500: #78879f;
  --color-abandoned-spaceship-600: #667286;
  --color-abandoned-spaceship-700: #515b6b;
  --color-abandoned-spaceship-800: #3b434f;
  --color-abandoned-spaceship-900: #282e37;
  --color-abandoned-spaceship-950: #161b22;
}

SCSS

$abandoned-spaceship: #68758a;
$abandoned-spaceship-rgb: 104, 117, 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);
}