#707688

CSS

:root {
  --abandoned-spaceship: #707688;
  --abandoned-spaceship-rgb: 112 118 136;
  --abandoned-spaceship-oklch: oklch(0.567 0.029 270.9);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(225 10% 49%);
  border-color: oklch(0.567 0.029 270.9);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #707688;
  --color-abandoned-spaceship-50: #f2f5fe;
  --color-abandoned-spaceship-100: #e4e7f2;
  --color-abandoned-spaceship-200: #d0d4e1;
  --color-abandoned-spaceship-300: #b2b7c7;
  --color-abandoned-spaceship-400: #989eb0;
  --color-abandoned-spaceship-500: #7f869a;
  --color-abandoned-spaceship-600: #6b7182;
  --color-abandoned-spaceship-700: #565a68;
  --color-abandoned-spaceship-800: #3e424d;
  --color-abandoned-spaceship-900: #2b2e35;
  --color-abandoned-spaceship-950: #181a20;
}

SCSS

$abandoned-spaceship: #707688;
$abandoned-spaceship-rgb: 112, 118, 136;
$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);
}