#6471AD

CSS

:root {
  --loch-ness: #6471ad;
  --loch-ness-rgb: 100 113 173;
  --loch-ness-oklch: oklch(0.564 0.094 273.7);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(229 31% 54%);
  border-color: oklch(0.564 0.094 273.7);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6471ad;
  --color-loch-ness-50: #edf4ff;
  --color-loch-ness-100: #dfe6ff;
  --color-loch-ness-200: #c8d2fd;
  --color-loch-ness-300: #a9b4e8;
  --color-loch-ness-400: #8d9bd7;
  --color-loch-ness-500: #7281c5;
  --color-loch-ness-600: #616da6;
  --color-loch-ness-700: #4d5785;
  --color-loch-ness-800: #374063;
  --color-loch-ness-900: #252c46;
  --color-loch-ness-950: #14192d;
}

SCSS

$loch-ness: #6471ad;
$loch-ness-rgb: 100, 113, 173;
$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);
}