#6670B3

CSS

:root {
  --loch-ness: #6670b3;
  --loch-ness-rgb: 102 112 179;
  --loch-ness-oklch: oklch(0.566 0.104 276.1);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(232 34% 55%);
  border-color: oklch(0.566 0.104 276.1);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6670b3;
  --color-loch-ness-50: #eef3ff;
  --color-loch-ness-100: #dfe5ff;
  --color-loch-ness-200: #c9d1ff;
  --color-loch-ness-300: #abb3ed;
  --color-loch-ness-400: #8e99dc;
  --color-loch-ness-500: #747fca;
  --color-loch-ness-600: #626cab;
  --color-loch-ness-700: #4e5689;
  --color-loch-ness-800: #373f66;
  --color-loch-ness-900: #262c48;
  --color-loch-ness-950: #14192f;
}

SCSS

$loch-ness: #6670b3;
$loch-ness-rgb: 102, 112, 179;
$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);
}