#6F7689

CSS

:root {
  --abandoned-spaceship: #6f7689;
  --abandoned-spaceship-rgb: 111 118 137;
  --abandoned-spaceship-oklch: oklch(0.567 0.031 269.4);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(224 10% 49%);
  border-color: oklch(0.567 0.031 269.4);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #6f7689;
  --color-abandoned-spaceship-50: #f2f5fe;
  --color-abandoned-spaceship-100: #e4e8f2;
  --color-abandoned-spaceship-200: #cfd4e2;
  --color-abandoned-spaceship-300: #b1b7c8;
  --color-abandoned-spaceship-400: #979eb1;
  --color-abandoned-spaceship-500: #7e869b;
  --color-abandoned-spaceship-600: #6b7183;
  --color-abandoned-spaceship-700: #555a69;
  --color-abandoned-spaceship-800: #3e424d;
  --color-abandoned-spaceship-900: #2a2e36;
  --color-abandoned-spaceship-950: #181a21;
}

SCSS

$abandoned-spaceship: #6f7689;
$abandoned-spaceship-rgb: 111, 118, 137;
$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);
}