#779CD8

CSS

:root {
  --wisteria-blue: #779cd8;
  --wisteria-blue-rgb: 119 156 216;
  --wisteria-blue-oklch: oklch(0.689 0.098 259.8);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(217 55% 66%);
  border-color: oklch(0.689 0.098 259.8);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #779cd8;
  --color-wisteria-blue-50: #e6f6ff;
  --color-wisteria-blue-100: #d6e9ff;
  --color-wisteria-blue-200: #bed5ff;
  --color-wisteria-blue-300: #9cb8ea;
  --color-wisteria-blue-400: #7c9fd9;
  --color-wisteria-blue-500: #5f86c7;
  --color-wisteria-blue-600: #5172a8;
  --color-wisteria-blue-700: #405b87;
  --color-wisteria-blue-800: #2c4364;
  --color-wisteria-blue-900: #1e2e46;
  --color-wisteria-blue-950: #0e1b2e;
}

SCSS

$wisteria-blue: #779cd8;
$wisteria-blue-rgb: 119, 156, 216;
$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);
}