#60779D

CSS

:root {
  --misty-harbour: #60779d;
  --misty-harbour-rgb: 96 119 157;
  --misty-harbour-oklch: oklch(0.566 0.065 260.3);
}

.element {
  color: var(--misty-harbour);
  background-color: hsl(217 24% 50%);
  border-color: oklch(0.566 0.065 260.3);
}

Tailwind CSS v4

@theme {
  --color-misty-harbour: #60779d;
  --color-misty-harbour-50: #ebf6ff;
  --color-misty-harbour-100: #dce8fe;
  --color-misty-harbour-200: #c5d5f1;
  --color-misty-harbour-300: #a6b8da;
  --color-misty-harbour-400: #889fc6;
  --color-misty-harbour-500: #6d87b2;
  --color-misty-harbour-600: #5d7296;
  --color-misty-harbour-700: #4a5b78;
  --color-misty-harbour-800: #344359;
  --color-misty-harbour-900: #242e3e;
  --color-misty-harbour-950: #131b27;
}

SCSS

$misty-harbour: #60779d;
$misty-harbour-rgb: 96, 119, 157;
$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);
}