#739BE2

CSS

:root {
  --wisteria-blue: #739be2;
  --wisteria-blue-rgb: 115 155 226;
  --wisteria-blue-oklch: oklch(0.69 0.114 261.4);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(218 66% 67%);
  border-color: oklch(0.69 0.114 261.4);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #739be2;
  --color-wisteria-blue-50: #e4f6ff;
  --color-wisteria-blue-100: #d4e9ff;
  --color-wisteria-blue-200: #bbd5ff;
  --color-wisteria-blue-300: #99b7f3;
  --color-wisteria-blue-400: #789ee2;
  --color-wisteria-blue-500: #5a85d1;
  --color-wisteria-blue-600: #4d71b1;
  --color-wisteria-blue-700: #3d5a8e;
  --color-wisteria-blue-800: #2a426a;
  --color-wisteria-blue-900: #1c2e4a;
  --color-wisteria-blue-950: #0c1a31;
}

SCSS

$wisteria-blue: #739be2;
$wisteria-blue-rgb: 115, 155, 226;
$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);
}