#739AE5

CSS

:root {
  --wisteria-blue: #739ae5;
  --wisteria-blue-rgb: 115 154 229;
  --wisteria-blue-oklch: oklch(0.689 0.119 262.7);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(219 69% 67%);
  border-color: oklch(0.689 0.119 262.7);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #739ae5;
  --color-wisteria-blue-50: #e4f6ff;
  --color-wisteria-blue-100: #d4e8ff;
  --color-wisteria-blue-200: #bbd4ff;
  --color-wisteria-blue-300: #99b7f5;
  --color-wisteria-blue-400: #789ee5;
  --color-wisteria-blue-500: #5b84d5;
  --color-wisteria-blue-600: #4d70b4;
  --color-wisteria-blue-700: #3d5990;
  --color-wisteria-blue-800: #2a426b;
  --color-wisteria-blue-900: #1c2d4c;
  --color-wisteria-blue-950: #0c1a32;
}

SCSS

$wisteria-blue: #739ae5;
$wisteria-blue-rgb: 115, 154, 229;
$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);
}