#5E6EC8

CSS

:root {
  --loch-ness: #5e6ec8;
  --loch-ness-rgb: 94 110 200;
  --loch-ness-oklch: oklch(0.569 0.139 273.6);
}

.element {
  color: var(--loch-ness);
  background-color: hsl(231 49% 58%);
  border-color: oklch(0.569 0.139 273.6);
}

Tailwind CSS v4

@theme {
  --color-loch-ness: #5e6ec8;
  --color-loch-ness-50: #e9f3ff;
  --color-loch-ness-100: #dae5ff;
  --color-loch-ness-200: #c3d0ff;
  --color-loch-ness-300: #a3b1ff;
  --color-loch-ness-400: #8597f0;
  --color-loch-ness-500: #6a7ce1;
  --color-loch-ness-600: #5a69be;
  --color-loch-ness-700: #485499;
  --color-loch-ness-800: #323e72;
  --color-loch-ness-900: #222b50;
  --color-loch-ness-950: #111836;
}

SCSS

$loch-ness: #5e6ec8;
$loch-ness-rgb: 94, 110, 200;
$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);
}