#263547

CSS

:root {
  --dark-stormy: #263547;
  --dark-stormy-rgb: 38 53 71;
  --dark-stormy-oklch: oklch(0.324 0.038 253.4);
}

.element {
  color: var(--dark-stormy);
  background-color: hsl(213 30% 21%);
  border-color: oklch(0.324 0.038 253.4);
}

Tailwind CSS v4

@theme {
  --color-dark-stormy: #263547;
  --color-dark-stormy-50: #eef6ff;
  --color-dark-stormy-100: #e0e9f5;
  --color-dark-stormy-200: #cad5e5;
  --color-dark-stormy-300: #abb9cb;
  --color-dark-stormy-400: #8fa0b5;
  --color-dark-stormy-500: #75889f;
  --color-dark-stormy-600: #637387;
  --color-dark-stormy-700: #4f5c6c;
  --color-dark-stormy-800: #39434f;
  --color-dark-stormy-900: #272f37;
  --color-dark-stormy-950: #151b22;
}

SCSS

$dark-stormy: #263547;
$dark-stormy-rgb: 38, 53, 71;
$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);
}