#819CC6

CSS

:root {
  --wisteria-blue: #819cc6;
  --wisteria-blue-rgb: 129 156 198;
  --wisteria-blue-oklch: oklch(0.688 0.069 259.1);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(217 38% 64%);
  border-color: oklch(0.688 0.069 259.1);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #819cc6;
  --color-wisteria-blue-50: #eaf6ff;
  --color-wisteria-blue-100: #dbe9ff;
  --color-wisteria-blue-200: #c4d5f3;
  --color-wisteria-blue-300: #a4b8dc;
  --color-wisteria-blue-400: #86a0c8;
  --color-wisteria-blue-500: #6a87b4;
  --color-wisteria-blue-600: #5a7398;
  --color-wisteria-blue-700: #485c7a;
  --color-wisteria-blue-800: #33435a;
  --color-wisteria-blue-900: #232e3f;
  --color-wisteria-blue-950: #121b28;
}

SCSS

$wisteria-blue: #819cc6;
$wisteria-blue-rgb: 129, 156, 198;
$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);
}