#596FC6

CSS

:root {
  --loch-ness: #596fc6;
  --loch-ness-rgb: 89 111 198;
  --loch-ness-oklch: oklch(0.566 0.137 270.8);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(228 49% 56%);
  border-color: oklch(0.566 0.137 270.8);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #596fc6;
  --color-loch-ness-50: #e8f4ff;
  --color-loch-ness-100: #d8e6ff;
  --color-loch-ness-200: #c0d1ff;
  --color-loch-ness-300: #a0b3fe;
  --color-loch-ness-400: #8199ef;
  --color-loch-ness-500: #657ee0;
  --color-loch-ness-600: #566bbd;
  --color-loch-ness-700: #445598;
  --color-loch-ness-800: #2f3f71;
  --color-loch-ness-900: #202b50;
  --color-loch-ness-950: #101835;
}

SCSS

$loch-ness: #596fc6;
$loch-ness-rgb: 89, 111, 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);
}