Dark Crypt

CSS

:root {
  --dark-crypt: #3f4551;
  --dark-crypt-rgb: 63 69 81;
  --dark-crypt-oklch: oklch(0.39 0.022 264.3);
}

.element {
  color: var(--dark-crypt);
  background-color: hsl(220 12% 28%);
  border-color: oklch(0.39 0.022 264.3);
}

Tailwind CSS v4

@theme {
  --color-dark-crypt: #3f4551;
  --color-dark-crypt-50: #f2f5fc;
  --color-dark-crypt-100: #e4e8ef;
  --color-dark-crypt-200: #d0d4de;
  --color-dark-crypt-300: #b2b7c3;
  --color-dark-crypt-400: #989fac;
  --color-dark-crypt-500: #7f8695;
  --color-dark-crypt-600: #6b727e;
  --color-dark-crypt-700: #565b65;
  --color-dark-crypt-800: #3e434a;
  --color-dark-crypt-900: #2b2e33;
  --color-dark-crypt-950: #181b1f;
}

SCSS

$dark-crypt: #3f4551;
$dark-crypt-rgb: 63, 69, 81;
$dark-crypt-light: mix(#fff, $dark-crypt, 20%);
$dark-crypt-dark: mix(#000, $dark-crypt, 20%);

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