#5F6DC9

CSS

:root {
  --loch-ness: #5f6dc9;
  --loch-ness-rgb: 95 109 201;
  --loch-ness-oklch: oklch(0.568 0.142 274.5);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(232 50% 58%);
  border-color: oklch(0.568 0.142 274.5);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5f6dc9;
  --color-loch-ness-50: #eaf2ff;
  --color-loch-ness-100: #dbe5ff;
  --color-loch-ness-200: #c4cfff;
  --color-loch-ness-300: #a4b1ff;
  --color-loch-ness-400: #8696f1;
  --color-loch-ness-500: #6b7be3;
  --color-loch-ness-600: #5b68bf;
  --color-loch-ness-700: #49549a;
  --color-loch-ness-800: #323d73;
  --color-loch-ness-900: #222a51;
  --color-loch-ness-950: #121736;
}

SCSS

$loch-ness: #5f6dc9;
$loch-ness-rgb: 95, 109, 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);
}