#363D52

CSS

:root {
  --dark-stormy: #363d52;
  --dark-stormy-rgb: 54 61 82;
  --dark-stormy-oklch: oklch(0.363 0.038 270.2);
}

.element {
  color: var(--dark-stormy);
  background-color: hsl(225 21% 27%);
  border-color: oklch(0.363 0.038 270.2);
}

Tailwind CSS v4

@theme {
  --color-dark-stormy: #363d52;
  --color-dark-stormy-50: #f1f5ff;
  --color-dark-stormy-100: #e3e7f5;
  --color-dark-stormy-200: #ced4e5;
  --color-dark-stormy-300: #b0b7cb;
  --color-dark-stormy-400: #969eb5;
  --color-dark-stormy-500: #7c85a0;
  --color-dark-stormy-600: #697187;
  --color-dark-stormy-700: #545a6c;
  --color-dark-stormy-800: #3d4250;
  --color-dark-stormy-900: #2a2e38;
  --color-dark-stormy-950: #171a22;
}

SCSS

$dark-stormy: #363d52;
$dark-stormy-rgb: 54, 61, 82;
$dark-stormy-light: mix(#fff, $dark-stormy, 20%);
$dark-stormy-dark: mix(#000, $dark-stormy, 20%);

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