#5C74A8

CSS

:root {
  --loch-ness: #5c74a8;
  --loch-ness-rgb: 92 116 168;
  --loch-ness-oklch: oklch(0.562 0.086 264.8);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(221 30% 51%);
  border-color: oklch(0.562 0.086 264.8);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5c74a8;
  --color-loch-ness-50: #eaf5ff;
  --color-loch-ness-100: #dbe8ff;
  --color-loch-ness-200: #c4d4fa;
  --color-loch-ness-300: #a3b7e4;
  --color-loch-ness-400: #859ed2;
  --color-loch-ness-500: #6a85c0;
  --color-loch-ness-600: #5a71a2;
  --color-loch-ness-700: #485a82;
  --color-loch-ness-800: #324260;
  --color-loch-ness-900: #222e44;
  --color-loch-ness-950: #111a2c;
}

SCSS

$loch-ness: #5c74a8;
$loch-ness-rgb: 92, 116, 168;
$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);
}