#61759D

CSS

:root {
  --misty-harbour: #61759d;
  --misty-harbour-rgb: 97 117 157;
  --misty-harbour-oklch: oklch(0.562 0.067 263.8);
}

.element {
  color: var(--misty-harbour);
  background-color: hsl(220 24% 50%);
  border-color: oklch(0.562 0.067 263.8);
}

Tailwind CSS v4

@theme {
  --color-misty-harbour: #61759d;
  --color-misty-harbour-50: #ecf5ff;
  --color-misty-harbour-100: #dde8ff;
  --color-misty-harbour-200: #c7d4f2;
  --color-misty-harbour-300: #a7b7db;
  --color-misty-harbour-400: #8a9fc7;
  --color-misty-harbour-500: #6f86b3;
  --color-misty-harbour-600: #5f7197;
  --color-misty-harbour-700: #4b5b79;
  --color-misty-harbour-800: #36435a;
  --color-misty-harbour-900: #252e3f;
  --color-misty-harbour-950: #131b28;
}

SCSS

$misty-harbour: #61759d;
$misty-harbour-rgb: 97, 117, 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);
}