#676EB9

CSS

:root {
  --loch-ness: #676eb9;
  --loch-ness-rgb: 103 110 185;
  --loch-ness-oklch: oklch(0.566 0.115 278);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(235 37% 56%);
  border-color: oklch(0.566 0.115 278);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #676eb9;
  --color-loch-ness-50: #eef2ff;
  --color-loch-ness-100: #e0e4ff;
  --color-loch-ness-200: #cad0ff;
  --color-loch-ness-300: #abb1f2;
  --color-loch-ness-400: #8e97e2;
  --color-loch-ness-500: #757dd1;
  --color-loch-ness-600: #636ab1;
  --color-loch-ness-700: #4f558e;
  --color-loch-ness-800: #383e6a;
  --color-loch-ness-900: #262b4a;
  --color-loch-ness-950: #151831;
}

SCSS

$loch-ness: #676eb9;
$loch-ness-rgb: 103, 110, 185;
$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);
}