#779DD2

CSS

:root {
  --wisteria-blue: #779dd2;
  --wisteria-blue-rgb: 119 157 210;
  --wisteria-blue-oklch: oklch(0.689 0.089 256.8);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(215 50% 65%);
  border-color: oklch(0.689 0.089 256.8);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #779dd2;
  --color-wisteria-blue-50: #e6f6ff;
  --color-wisteria-blue-100: #d6e9ff;
  --color-wisteria-blue-200: #bed6fb;
  --color-wisteria-blue-300: #9cb9e6;
  --color-wisteria-blue-400: #7ca1d3;
  --color-wisteria-blue-500: #5f88c1;
  --color-wisteria-blue-600: #5173a3;
  --color-wisteria-blue-700: #405c83;
  --color-wisteria-blue-800: #2d4461;
  --color-wisteria-blue-900: #1e2f44;
  --color-wisteria-blue-950: #0e1b2c;
}

SCSS

$wisteria-blue: #779dd2;
$wisteria-blue-rgb: 119, 157, 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);
}