#6371AE

CSS

:root {
  --loch-ness: #6371ae;
  --loch-ness-rgb: 99 113 174;
  --loch-ness-oklch: oklch(0.564 0.096 273.1);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(229 32% 54%);
  border-color: oklch(0.564 0.096 273.1);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6371ae;
  --color-loch-ness-50: #edf4ff;
  --color-loch-ness-100: #dee6ff;
  --color-loch-ness-200: #c8d2fe;
  --color-loch-ness-300: #a9b4e9;
  --color-loch-ness-400: #8c9bd8;
  --color-loch-ness-500: #7181c6;
  --color-loch-ness-600: #606da7;
  --color-loch-ness-700: #4d5786;
  --color-loch-ness-800: #364064;
  --color-loch-ness-900: #252c46;
  --color-loch-ness-950: #14192e;
}

SCSS

$loch-ness: #6371ae;
$loch-ness-rgb: 99, 113, 174;
$loch-ness-light: mix(#fff, $loch-ness, 20%);
$loch-ness-dark: mix(#000, $loch-ness, 20%);

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