#737684

CSS

:root {
  --abandoned-spaceship: #737684;
  --abandoned-spaceship-rgb: 115 118 132;
  --abandoned-spaceship-oklch: oklch(0.568 0.022 276.1);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(229 7% 48%);
  border-color: oklch(0.568 0.022 276.1);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #737684;
  --color-abandoned-spaceship-50: #f3f5fb;
  --color-abandoned-spaceship-100: #e6e7ef;
  --color-abandoned-spaceship-200: #d2d3de;
  --color-abandoned-spaceship-300: #b4b7c3;
  --color-abandoned-spaceship-400: #9b9eac;
  --color-abandoned-spaceship-500: #828595;
  --color-abandoned-spaceship-600: #6e717e;
  --color-abandoned-spaceship-700: #585a65;
  --color-abandoned-spaceship-800: #40424a;
  --color-abandoned-spaceship-900: #2c2d33;
  --color-abandoned-spaceship-950: #191a1f;
}

SCSS

$abandoned-spaceship: #737684;
$abandoned-spaceship-rgb: 115, 118, 132;
$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);
}