Aristocratic Blue

CSS

:root {
  --aristocratic-blue: #354655;
  --aristocratic-blue-rgb: 53 70 85;
  --aristocratic-blue-oklch: oklch(0.386 0.034 245.5);
}

.element {
  color: var(--aristocratic-blue);
  background-color: hsl(208 23% 27%);
  border-color: oklch(0.386 0.034 245.5);
}

Tailwind CSS v4

@theme {
  --color-aristocratic-blue: #354655;
  --color-aristocratic-blue-50: #eef6ff;
  --color-aristocratic-blue-100: #dfe9f3;
  --color-aristocratic-blue-200: #c9d6e2;
  --color-aristocratic-blue-300: #aab9c8;
  --color-aristocratic-blue-400: #8fa1b1;
  --color-aristocratic-blue-500: #74899b;
  --color-aristocratic-blue-600: #637483;
  --color-aristocratic-blue-700: #4f5d69;
  --color-aristocratic-blue-800: #39444d;
  --color-aristocratic-blue-900: #272f36;
  --color-aristocratic-blue-950: #151b21;
}

SCSS

$aristocratic-blue: #354655;
$aristocratic-blue-rgb: 53, 70, 85;
$aristocratic-blue-light: mix(#fff, $aristocratic-blue, 20%);
$aristocratic-blue-dark: mix(#000, $aristocratic-blue, 20%);

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