#6370B8

CSS

:root {
  --loch-ness: #6370b8;
  --loch-ness-rgb: 99 112 184;
  --loch-ness-oklch: oklch(0.567 0.112 274.5);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(231 37% 55%);
  border-color: oklch(0.567 0.112 274.5);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6370b8;
  --color-loch-ness-50: #ecf3ff;
  --color-loch-ness-100: #dde5ff;
  --color-loch-ness-200: #c7d1ff;
  --color-loch-ness-300: #a8b3f1;
  --color-loch-ness-400: #8a99e1;
  --color-loch-ness-500: #707fd0;
  --color-loch-ness-600: #5f6caf;
  --color-loch-ness-700: #4c568d;
  --color-loch-ness-800: #353f69;
  --color-loch-ness-900: #242b4a;
  --color-loch-ness-950: #131931;
}

SCSS

$loch-ness: #6370b8;
$loch-ness-rgb: 99, 112, 184;
$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);
}