#5F6EC4

CSS

:root {
  --loch-ness: #5f6ec4;
  --loch-ness-rgb: 95 110 196;
  --loch-ness-oklch: oklch(0.567 0.133 273.9);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(231 46% 57%);
  border-color: oklch(0.567 0.133 273.9);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5f6ec4;
  --color-loch-ness-50: #eaf3ff;
  --color-loch-ness-100: #dbe5ff;
  --color-loch-ness-200: #c4d0ff;
  --color-loch-ness-300: #a5b2fc;
  --color-loch-ness-400: #8698ed;
  --color-loch-ness-500: #6c7ddd;
  --color-loch-ness-600: #5b6abb;
  --color-loch-ness-700: #495496;
  --color-loch-ness-800: #333e70;
  --color-loch-ness-900: #222b4f;
  --color-loch-ness-950: #121835;
}

SCSS

$loch-ness: #5f6ec4;
$loch-ness-rgb: 95, 110, 196;
$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);
}