#2D70AA

CSS

:root {
  --muted-blue: #2d70aa;
  --muted-blue-rgb: 45 112 170;
  --muted-blue-oklch: oklch(0.531 0.114 248);
}

.element {
  color: var(--muted-blue);
  background-color: hsl(208 58% 42%);
  border-color: oklch(0.531 0.114 248);
}

Tailwind CSS v4

@theme {
  --color-muted-blue: #2d70aa;
  --color-muted-blue-50: #ddf8ff;
  --color-muted-blue-100: #ccecff;
  --color-muted-blue-200: #b0d9ff;
  --color-muted-blue-300: #8bbcf0;
  --color-muted-blue-400: #65a4de;
  --color-muted-blue-500: #408bcd;
  --color-muted-blue-600: #3876ad;
  --color-muted-blue-700: #2c5e8b;
  --color-muted-blue-800: #1c4567;
  --color-muted-blue-900: #123048;
  --color-muted-blue-950: #041c2f;
}

SCSS

$muted-blue: #2d70aa;
$muted-blue-rgb: 45, 112, 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);
}