#6172B0

CSS

:root {
  --loch-ness: #6172b0;
  --loch-ness-rgb: 97 114 176;
  --loch-ness-oklch: oklch(0.565 0.098 271.3);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(227 33% 54%);
  border-color: oklch(0.565 0.098 271.3);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6172b0;
  --color-loch-ness-50: #ecf4ff;
  --color-loch-ness-100: #dde6ff;
  --color-loch-ness-200: #c6d2ff;
  --color-loch-ness-300: #a7b4ea;
  --color-loch-ness-400: #899bd9;
  --color-loch-ness-500: #6f82c7;
  --color-loch-ness-600: #5e6ea8;
  --color-loch-ness-700: #4b5887;
  --color-loch-ness-800: #354065;
  --color-loch-ness-900: #242c47;
  --color-loch-ness-950: #13192e;
}

SCSS

$loch-ness: #6172b0;
$loch-ness-rgb: 97, 114, 176;
$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);
}