#839BC8

CSS

:root {
  --wisteria-blue: #839bc8;
  --wisteria-blue-rgb: 131 155 200;
  --wisteria-blue-oklch: oklch(0.688 0.072 262.8);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(219 39% 65%);
  border-color: oklch(0.688 0.072 262.8);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #839bc8;
  --color-wisteria-blue-50: #ebf5ff;
  --color-wisteria-blue-100: #dce8ff;
  --color-wisteria-blue-200: #c5d5f4;
  --color-wisteria-blue-300: #a5b8dd;
  --color-wisteria-blue-400: #889fca;
  --color-wisteria-blue-500: #6d86b6;
  --color-wisteria-blue-600: #5c729a;
  --color-wisteria-blue-700: #495b7c;
  --color-wisteria-blue-800: #34435c;
  --color-wisteria-blue-900: #232e40;
  --color-wisteria-blue-950: #121b29;
}

SCSS

$wisteria-blue: #839bc8;
$wisteria-blue-rgb: 131, 155, 200;
$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);
}