#696CC3

CSS

:root {
  --loch-ness: #696cc3;
  --loch-ness-rgb: 105 108 195;
  --loch-ness-oklch: oklch(0.57 0.132 279.8);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(238 43% 59%);
  border-color: oklch(0.57 0.132 279.8);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #696cc3;
  --color-loch-ness-50: #eef1ff;
  --color-loch-ness-100: #e0e3ff;
  --color-loch-ness-200: #caceff;
  --color-loch-ness-300: #acaffa;
  --color-loch-ness-400: #8f95eb;
  --color-loch-ness-500: #7679db;
  --color-loch-ness-600: #6467b9;
  --color-loch-ness-700: #505295;
  --color-loch-ness-800: #383c6f;
  --color-loch-ness-900: #262a4e;
  --color-loch-ness-950: #151734;
}

SCSS

$loch-ness: #696cc3;
$loch-ness-rgb: 105, 108, 195;
$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);
}