Metallic Blue

CSS

:root {
  --metallic-blue: #4f738e;
  --metallic-blue-rgb: 79 115 142;
  --metallic-blue-oklch: oklch(0.539 0.059 241.6);
}

.element {
  color: var(--metallic-blue);
  background-color: hsl(206 29% 43%);
  border-color: oklch(0.539 0.059 241.6);
}

Tailwind CSS v4

@theme {
  --color-metallic-blue: #4f738e;
  --color-metallic-blue-50: #e7f8ff;
  --color-metallic-blue-100: #d8ebfb;
  --color-metallic-blue-200: #c0d8ec;
  --color-metallic-blue-300: #9ebbd4;
  --color-metallic-blue-400: #80a3bf;
  --color-metallic-blue-500: #638baa;
  --color-metallic-blue-600: #547690;
  --color-metallic-blue-700: #435e73;
  --color-metallic-blue-800: #2f4555;
  --color-metallic-blue-900: #20303b;
  --color-metallic-blue-950: #0f1c25;
}

SCSS

$metallic-blue: #4f738e;
$metallic-blue-rgb: 79, 115, 142;
$metallic-blue-light: mix(#fff, $metallic-blue, 20%);
$metallic-blue-dark: mix(#000, $metallic-blue, 20%);

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