#5F6FC1

CSS

:root {
  --loch-ness: #5f6fc1;
  --loch-ness-rgb: 95 111 193;
  --loch-ness-oklch: oklch(0.567 0.128 273.4);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(230 44% 56%);
  border-color: oklch(0.567 0.128 273.4);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5f6fc1;
  --color-loch-ness-50: #eaf3ff;
  --color-loch-ness-100: #dbe5ff;
  --color-loch-ness-200: #c4d1ff;
  --color-loch-ness-300: #a5b2f9;
  --color-loch-ness-400: #8698ea;
  --color-loch-ness-500: #6c7eda;
  --color-loch-ness-600: #5b6bb8;
  --color-loch-ness-700: #495594;
  --color-loch-ness-800: #333f6e;
  --color-loch-ness-900: #222b4e;
  --color-loch-ness-950: #121834;
}

SCSS

$loch-ness: #5f6fc1;
$loch-ness-rgb: 95, 111, 193;
$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);
}