#839FE1

CSS

:root {
  --wisteria-blue: #839fe1;
  --wisteria-blue-rgb: 131 159 225;
  --wisteria-blue-oklch: oklch(0.707 0.102 266.2);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(222 61% 70%);
  border-color: oklch(0.707 0.102 266.2);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #839fe1;
  --color-wisteria-blue-50: #e9f5ff;
  --color-wisteria-blue-100: #d9e7ff;
  --color-wisteria-blue-200: #c2d3ff;
  --color-wisteria-blue-300: #a1b6ed;
  --color-wisteria-blue-400: #829ddb;
  --color-wisteria-blue-500: #6683ca;
  --color-wisteria-blue-600: #576fab;
  --color-wisteria-blue-700: #455989;
  --color-wisteria-blue-800: #304166;
  --color-wisteria-blue-900: #212d48;
  --color-wisteria-blue-950: #101a2f;
}

SCSS

$wisteria-blue: #839fe1;
$wisteria-blue-rgb: 131, 159, 225;
$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);
}