#414258

CSS

:root {
  --lava-stone: #414258;
  --lava-stone-rgb: 65 66 88;
  --lava-stone-oklch: oklch(0.387 0.037 282.5);
}

.element {
  color: var(--lava-stone);
  background-color: hsl(237 15% 30%);
  border-color: oklch(0.387 0.037 282.5);
}

Tailwind CSS v4

@theme {
  --color-lava-stone: #414258;
  --color-lava-stone-50: #f3f4ff;
  --color-lava-stone-100: #e6e6f4;
  --color-lava-stone-200: #d2d2e4;
  --color-lava-stone-300: #b5b5ca;
  --color-lava-stone-400: #9b9cb4;
  --color-lava-stone-500: #82849f;
  --color-lava-stone-600: #6e6f86;
  --color-lava-stone-700: #58596c;
  --color-lava-stone-800: #40414f;
  --color-lava-stone-900: #2c2d37;
  --color-lava-stone-950: #191a22;
}

SCSS

$lava-stone: #414258;
$lava-stone-rgb: 65, 66, 88;
$lava-stone-light: mix(#fff, $lava-stone, 20%);
$lava-stone-dark: mix(#000, $lava-stone, 20%);

.element {
  color: $lava-stone;
  box-shadow: 0 0 0 2px rgba($lava-stone, 0.35);
}