#676CC5

CSS

:root {
  --loch-ness: #676cc5;
  --loch-ness-rgb: 103 108 197;
  --loch-ness-oklch: oklch(0.569 0.136 278.7);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(237 45% 59%);
  border-color: oklch(0.569 0.136 278.7);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #676cc5;
  --color-loch-ness-50: #edf2ff;
  --color-loch-ness-100: #dfe4ff;
  --color-loch-ness-200: #c9ceff;
  --color-loch-ness-300: #abaffc;
  --color-loch-ness-400: #8d95ed;
  --color-loch-ness-500: #747ade;
  --color-loch-ness-600: #6267bb;
  --color-loch-ness-700: #4e5296;
  --color-loch-ness-800: #373c70;
  --color-loch-ness-900: #252a4f;
  --color-loch-ness-950: #141735;
}

SCSS

$loch-ness: #676cc5;
$loch-ness-rgb: 103, 108, 197;
$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);
}