#5E72B3

CSS

:root {
  --loch-ness: #5e72b3;
  --loch-ness-rgb: 94 114 179;
  --loch-ness-oklch: oklch(0.565 0.104 269.9);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(226 36% 54%);
  border-color: oklch(0.565 0.104 269.9);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5e72b3;
  --color-loch-ness-50: #eaf4ff;
  --color-loch-ness-100: #dbe7ff;
  --color-loch-ness-200: #c4d2ff;
  --color-loch-ness-300: #a4b5ed;
  --color-loch-ness-400: #869bdc;
  --color-loch-ness-500: #6b82cb;
  --color-loch-ness-600: #5b6eab;
  --color-loch-ness-700: #49588a;
  --color-loch-ness-800: #334166;
  --color-loch-ness-900: #222d48;
  --color-loch-ness-950: #12192f;
}

SCSS

$loch-ness: #5e72b3;
$loch-ness-rgb: 94, 114, 179;
$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);
}