#879FC9

CSS

:root {
  --wisteria-blue: #879fc9;
  --wisteria-blue-rgb: 135 159 201;
  --wisteria-blue-oklch: oklch(0.699 0.068 261.5);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(218 38% 66%);
  border-color: oklch(0.699 0.068 261.5);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #879fc9;
  --color-wisteria-blue-50: #ebf6ff;
  --color-wisteria-blue-100: #dce8ff;
  --color-wisteria-blue-200: #c5d5f2;
  --color-wisteria-blue-300: #a6b8db;
  --color-wisteria-blue-400: #889fc7;
  --color-wisteria-blue-500: #6d87b4;
  --color-wisteria-blue-600: #5d7298;
  --color-wisteria-blue-700: #4a5b7a;
  --color-wisteria-blue-800: #34435a;
  --color-wisteria-blue-900: #242e3f;
  --color-wisteria-blue-950: #131b28;
}

SCSS

$wisteria-blue: #879fc9;
$wisteria-blue-rgb: 135, 159, 201;
$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);
}