#6071B4

CSS

:root {
  --loch-ness: #6071b4;
  --loch-ness-rgb: 96 113 180;
  --loch-ness-oklch: oklch(0.565 0.106 271.9);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(228 36% 54%);
  border-color: oklch(0.565 0.106 271.9);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6071b4;
  --color-loch-ness-50: #ebf4ff;
  --color-loch-ness-100: #dce6ff;
  --color-loch-ness-200: #c6d2ff;
  --color-loch-ness-300: #a6b4ee;
  --color-loch-ness-400: #889bdd;
  --color-loch-ness-500: #6e81cc;
  --color-loch-ness-600: #5d6dac;
  --color-loch-ness-700: #4a578a;
  --color-loch-ness-800: #344067;
  --color-loch-ness-900: #232c48;
  --color-loch-ness-950: #12192f;
}

SCSS

$loch-ness: #6071b4;
$loch-ness-rgb: 96, 113, 180;
$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);
}