#326FAA

CSS

:root {
  --muted-blue: #326faa;
  --muted-blue-rgb: 50 111 170;
  --muted-blue-oklch: oklch(0.53 0.113 250.1);
}

.element {
  color: var(--muted-blue);
  background-color: hsl(210 55% 43%);
  border-color: oklch(0.53 0.113 250.1);
}

Tailwind CSS v4

@theme {
  --color-muted-blue: #326faa;
  --color-muted-blue-50: #dff8ff;
  --color-muted-blue-100: #ceebff;
  --color-muted-blue-200: #b2d8ff;
  --color-muted-blue-300: #8dbbf0;
  --color-muted-blue-400: #69a3de;
  --color-muted-blue-500: #468acd;
  --color-muted-blue-600: #3c75ad;
  --color-muted-blue-700: #305e8b;
  --color-muted-blue-800: #1f4567;
  --color-muted-blue-900: #143049;
  --color-muted-blue-950: #061c30;
}

SCSS

$muted-blue: #326faa;
$muted-blue-rgb: 50, 111, 170;
$muted-blue-light: mix(#fff, $muted-blue, 20%);
$muted-blue-dark: mix(#000, $muted-blue, 20%);

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