#6B778A

CSS

:root {
  --abandoned-spaceship: #6b778a;
  --abandoned-spaceship-rgb: 107 119 138;
  --abandoned-spaceship-oklch: oklch(0.566 0.033 259.6);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(217 13% 48%);
  border-color: oklch(0.566 0.033 259.6);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #6b778a;
  --color-abandoned-spaceship-50: #f0f5ff;
  --color-abandoned-spaceship-100: #e2e8f3;
  --color-abandoned-spaceship-200: #cdd5e3;
  --color-abandoned-spaceship-300: #aeb8c9;
  --color-abandoned-spaceship-400: #939fb2;
  --color-abandoned-spaceship-500: #7a879c;
  --color-abandoned-spaceship-600: #677284;
  --color-abandoned-spaceship-700: #525b6a;
  --color-abandoned-spaceship-800: #3b434e;
  --color-abandoned-spaceship-900: #292e36;
  --color-abandoned-spaceship-950: #171b21;
}

SCSS

$abandoned-spaceship: #6b778a;
$abandoned-spaceship-rgb: 107, 119, 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);
}