#5F72B2

CSS

:root {
  --loch-ness: #5f72b2;
  --loch-ness-rgb: 95 114 178;
  --loch-ness-oklch: oklch(0.565 0.102 270.3);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(226 35% 54%);
  border-color: oklch(0.565 0.102 270.3);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5f72b2;
  --color-loch-ness-50: #ebf4ff;
  --color-loch-ness-100: #dce7ff;
  --color-loch-ness-200: #c5d2ff;
  --color-loch-ness-300: #a5b5ec;
  --color-loch-ness-400: #879bdb;
  --color-loch-ness-500: #6c82ca;
  --color-loch-ness-600: #5c6eaa;
  --color-loch-ness-700: #495889;
  --color-loch-ness-800: #334166;
  --color-loch-ness-900: #232d48;
  --color-loch-ness-950: #12192f;
}

SCSS

$loch-ness: #5f72b2;
$loch-ness-rgb: 95, 114, 178;
$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);
}