#686EB8

CSS

:root {
  --loch-ness: #686eb8;
  --loch-ness-rgb: 104 110 184;
  --loch-ness-oklch: oklch(0.566 0.114 278.6);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(236 36% 56%);
  border-color: oklch(0.566 0.114 278.6);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #686eb8;
  --color-loch-ness-50: #eef2ff;
  --color-loch-ness-100: #e0e4ff;
  --color-loch-ness-200: #cbcfff;
  --color-loch-ness-300: #acb1f1;
  --color-loch-ness-400: #8f97e1;
  --color-loch-ness-500: #767dd0;
  --color-loch-ness-600: #646ab0;
  --color-loch-ness-700: #50558d;
  --color-loch-ness-800: #383e69;
  --color-loch-ness-900: #262b4a;
  --color-loch-ness-950: #151831;
}

SCSS

$loch-ness: #686eb8;
$loch-ness-rgb: 104, 110, 184;
$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);
}