#6B71B5

CSS

:root {
  --loch-ness: #6b71b5;
  --loch-ness-rgb: 107 113 181;
  --loch-ness-oklch: oklch(0.573 0.104 278.7);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(235 33% 56%);
  border-color: oklch(0.573 0.104 278.7);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #6b71b5;
  --color-loch-ness-50: #eff2ff;
  --color-loch-ness-100: #e1e5ff;
  --color-loch-ness-200: #cbd0ff;
  --color-loch-ness-300: #adb2ec;
  --color-loch-ness-400: #9198dc;
  --color-loch-ness-500: #777eca;
  --color-loch-ness-600: #656bab;
  --color-loch-ness-700: #515589;
  --color-loch-ness-800: #393f66;
  --color-loch-ness-900: #272b48;
  --color-loch-ness-950: #15182f;
}

SCSS

$loch-ness: #6b71b5;
$loch-ness-rgb: 107, 113, 181;
$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);
}