#5D6EC9

CSS

:root {
  --loch-ness: #5d6ec9;
  --loch-ness-rgb: 93 110 201;
  --loch-ness-oklch: oklch(0.569 0.141 273.2);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(231 50% 58%);
  border-color: oklch(0.569 0.141 273.2);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5d6ec9;
  --color-loch-ness-50: #e9f3ff;
  --color-loch-ness-100: #dae5ff;
  --color-loch-ness-200: #c2d0ff;
  --color-loch-ness-300: #a2b1ff;
  --color-loch-ness-400: #8497f1;
  --color-loch-ness-500: #697ce2;
  --color-loch-ness-600: #5969bf;
  --color-loch-ness-700: #475499;
  --color-loch-ness-800: #313e73;
  --color-loch-ness-900: #212b51;
  --color-loch-ness-950: #111836;
}

SCSS

$loch-ness: #5d6ec9;
$loch-ness-rgb: 93, 110, 201;
$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);
}