#6275A7

CSS

:root {
  --misty-harbour: #6275a7;
  --misty-harbour-rgb: 98 117 167;
  --misty-harbour-oklch: oklch(0.568 0.081 267.8);
}

.element {
  color: var(--misty-harbour);
  background-color: hsl(223 28% 52%);
  border-color: oklch(0.568 0.081 267.8);
}

Tailwind CSS v4

@theme {
  --color-misty-harbour: #6275a7;
  --color-misty-harbour-50: #ecf5ff;
  --color-misty-harbour-100: #dde7ff;
  --color-misty-harbour-200: #c6d3f8;
  --color-misty-harbour-300: #a7b6e2;
  --color-misty-harbour-400: #8a9dcf;
  --color-misty-harbour-500: #6f84bc;
  --color-misty-harbour-600: #5e709f;
  --color-misty-harbour-700: #4b5a80;
  --color-misty-harbour-800: #35425f;
  --color-misty-harbour-900: #242d42;
  --color-misty-harbour-950: #131a2b;
}

SCSS

$misty-harbour: #6275a7;
$misty-harbour-rgb: 98, 117, 167;
$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);
}