#6D74A0

CSS

:root {
  --misty-harbour: #6d74a0;
  --misty-harbour-rgb: 109 116 160;
  --misty-harbour-oklch: oklch(0.57 0.068 277);
}

.element {
  color: var(--misty-harbour);
  background-color: hsl(232 21% 53%);
  border-color: oklch(0.57 0.068 277);
}

Tailwind CSS v4

@theme {
  --color-misty-harbour: #6d74a0;
  --color-misty-harbour-50: #f0f4ff;
  --color-misty-harbour-100: #e2e6ff;
  --color-misty-harbour-200: #cdd2f2;
  --color-misty-harbour-300: #afb4db;
  --color-misty-harbour-400: #949bc7;
  --color-misty-harbour-500: #7a82b4;
  --color-misty-harbour-600: #686e98;
  --color-misty-harbour-700: #53587a;
  --color-misty-harbour-800: #3b415a;
  --color-misty-harbour-900: #292d3f;
  --color-misty-harbour-950: #171928;
}

SCSS

$misty-harbour: #6d74a0;
$misty-harbour-rgb: 109, 116, 160;
$misty-harbour-light: mix(#fff, $misty-harbour, 20%);
$misty-harbour-dark: mix(#000, $misty-harbour, 20%);

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