#686DC0

CSS

:root {
  --loch-ness: #686dc0;
  --loch-ness-rgb: 104 109 192;
  --loch-ness-oklch: oklch(0.569 0.127 278.9);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(237 41% 58%);
  border-color: oklch(0.569 0.127 278.9);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #686dc0;
  --color-loch-ness-50: #eef2ff;
  --color-loch-ness-100: #e0e4ff;
  --color-loch-ness-200: #cacfff;
  --color-loch-ness-300: #abb0f7;
  --color-loch-ness-400: #8e96e8;
  --color-loch-ness-500: #757bd8;
  --color-loch-ness-600: #6368b6;
  --color-loch-ness-700: #4f5392;
  --color-loch-ness-800: #383d6d;
  --color-loch-ness-900: #262a4d;
  --color-loch-ness-950: #151733;
}

SCSS

$loch-ness: #686dc0;
$loch-ness-rgb: 104, 109, 192;
$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);
}