#819AD2

CSS

:root {
  --wisteria-blue: #819ad2;
  --wisteria-blue-rgb: 129 154 210;
  --wisteria-blue-oklch: oklch(0.689 0.088 265.6);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(221 47% 66%);
  border-color: oklch(0.689 0.088 265.6);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #819ad2;
  --color-wisteria-blue-50: #eaf5ff;
  --color-wisteria-blue-100: #dbe8ff;
  --color-wisteria-blue-200: #c4d4fb;
  --color-wisteria-blue-300: #a4b7e5;
  --color-wisteria-blue-400: #869ed3;
  --color-wisteria-blue-500: #6a85c1;
  --color-wisteria-blue-600: #5a70a3;
  --color-wisteria-blue-700: #485a83;
  --color-wisteria-blue-800: #334261;
  --color-wisteria-blue-900: #222e44;
  --color-wisteria-blue-950: #111a2c;
}

SCSS

$wisteria-blue: #819ad2;
$wisteria-blue-rgb: 129, 154, 210;
$wisteria-blue-light: mix(#fff, $wisteria-blue, 20%);
$wisteria-blue-dark: mix(#000, $wisteria-blue, 20%);

.element {
  color: $wisteria-blue;
  box-shadow: 0 0 0 2px rgba($wisteria-blue, 0.35);
}