#696EC4

CSS

:root {
  --loch-ness: #696ec4;
  --loch-ness-rgb: 105 110 196;
  --loch-ness-oklch: oklch(0.574 0.131 278.9);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(237 44% 59%);
  border-color: oklch(0.574 0.131 278.9);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #696ec4;
  --color-loch-ness-50: #eef2ff;
  --color-loch-ness-100: #dfe4ff;
  --color-loch-ness-200: #caceff;
  --color-loch-ness-300: #abb0f9;
  --color-loch-ness-400: #8e95ea;
  --color-loch-ness-500: #757adb;
  --color-loch-ness-600: #6368b8;
  --color-loch-ness-700: #4f5394;
  --color-loch-ness-800: #373d6f;
  --color-loch-ness-900: #262a4e;
  --color-loch-ness-950: #141734;
}

SCSS

$loch-ness: #696ec4;
$loch-ness-rgb: 105, 110, 196;
$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);
}