#6D7787

CSS

:root {
  --abandoned-spaceship: #6d7787;
  --abandoned-spaceship-rgb: 109 119 135;
  --abandoned-spaceship-oklch: oklch(0.567 0.028 259.8);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(217 11% 48%);
  border-color: oklch(0.567 0.028 259.8);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #6d7787;
  --color-abandoned-spaceship-50: #f1f5fd;
  --color-abandoned-spaceship-100: #e3e8f1;
  --color-abandoned-spaceship-200: #ced5e0;
  --color-abandoned-spaceship-300: #b0b8c6;
  --color-abandoned-spaceship-400: #959faf;
  --color-abandoned-spaceship-500: #7c8799;
  --color-abandoned-spaceship-600: #697281;
  --color-abandoned-spaceship-700: #545b68;
  --color-abandoned-spaceship-800: #3d434c;
  --color-abandoned-spaceship-900: #2a2e35;
  --color-abandoned-spaceship-950: #171b20;
}

SCSS

$abandoned-spaceship: #6d7787;
$abandoned-spaceship-rgb: 109, 119, 135;
$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);
}