#686DBD

CSS

:root {
  --loch-ness: #686dbd;
  --loch-ness-rgb: 104 109 189;
  --loch-ness-oklch: oklch(0.567 0.122 279);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(236 39% 57%);
  border-color: oklch(0.567 0.122 279);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #686dbd;
  --color-loch-ness-50: #eef2ff;
  --color-loch-ness-100: #e0e4ff;
  --color-loch-ness-200: #cacfff;
  --color-loch-ness-300: #acb0f5;
  --color-loch-ness-400: #8f96e6;
  --color-loch-ness-500: #767bd5;
  --color-loch-ness-600: #6469b4;
  --color-loch-ness-700: #505491;
  --color-loch-ness-800: #383d6c;
  --color-loch-ness-900: #262a4c;
  --color-loch-ness-950: #151732;
}

SCSS

$loch-ness: #686dbd;
$loch-ness-rgb: 104, 109, 189;
$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);
}