#6F77A8

CSS

:root {
  --misty-harbour: #6f77a8;
  --misty-harbour-rgb: 111 119 168;
  --misty-harbour-oklch: oklch(0.582 0.076 276.6);
}

.element {
  color: var(--misty-harbour);
  background-color: hsl(232 25% 55%);
  border-color: oklch(0.582 0.076 276.6);
}

Tailwind CSS v4

@theme {
  --color-misty-harbour: #6f77a8;
  --color-misty-harbour-50: #f0f4ff;
  --color-misty-harbour-100: #e2e6ff;
  --color-misty-harbour-200: #ccd2f5;
  --color-misty-harbour-300: #aeb4df;
  --color-misty-harbour-400: #929bcc;
  --color-misty-harbour-500: #7982b8;
  --color-misty-harbour-600: #666e9c;
  --color-misty-harbour-700: #52587d;
  --color-misty-harbour-800: #3a405d;
  --color-misty-harbour-900: #282c41;
  --color-misty-harbour-950: #16192a;
}

SCSS

$misty-harbour: #6f77a8;
$misty-harbour-rgb: 111, 119, 168;
$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);
}