#5E6EC6

CSS

:root {
  --loch-ness: #5e6ec6;
  --loch-ness-rgb: 94 110 198;
  --loch-ness-oklch: oklch(0.568 0.136 273.5);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(231 48% 57%);
  border-color: oklch(0.568 0.136 273.5);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5e6ec6;
  --color-loch-ness-50: #eaf3ff;
  --color-loch-ness-100: #dae5ff;
  --color-loch-ness-200: #c3d0ff;
  --color-loch-ness-300: #a4b2fd;
  --color-loch-ness-400: #8597ef;
  --color-loch-ness-500: #6a7cdf;
  --color-loch-ness-600: #5a6abc;
  --color-loch-ness-700: #485497;
  --color-loch-ness-800: #323e71;
  --color-loch-ness-900: #222b50;
  --color-loch-ness-950: #111835;
}

SCSS

$loch-ness: #5e6ec6;
$loch-ness-rgb: 94, 110, 198;
$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);
}