Nocturne Blue

CSS

:root {
  --nocturne-blue: #37525f;
  --nocturne-blue-rgb: 55 82 95;
  --nocturne-blue-oklch: oklch(0.422 0.039 229.5);
}

.element {
  color: var(--nocturne-blue);
  background-color: hsl(200 27% 29%);
  border-color: oklch(0.422 0.039 229.5);
}

Tailwind CSS v4

@theme {
  --color-nocturne-blue: #37525f;
  --color-nocturne-blue-50: #ebf7ff;
  --color-nocturne-blue-100: #dcebf3;
  --color-nocturne-blue-200: #c4d8e2;
  --color-nocturne-blue-300: #a4bbc8;
  --color-nocturne-blue-400: #87a3b1;
  --color-nocturne-blue-500: #6c8c9b;
  --color-nocturne-blue-600: #5b7683;
  --color-nocturne-blue-700: #495e69;
  --color-nocturne-blue-800: #34454d;
  --color-nocturne-blue-900: #243036;
  --color-nocturne-blue-950: #121c21;
}

SCSS

$nocturne-blue: #37525f;
$nocturne-blue-rgb: 55, 82, 95;
$nocturne-blue-light: mix(#fff, $nocturne-blue, 20%);
$nocturne-blue-dark: mix(#000, $nocturne-blue, 20%);

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