#819BCC

CSS

:root {
  --wisteria-blue: #819bcc;
  --wisteria-blue-rgb: 129 155 204;
  --wisteria-blue-oklch: oklch(0.688 0.078 262.8);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(219 42% 65%);
  border-color: oklch(0.688 0.078 262.8);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #819bcc;
  --color-wisteria-blue-50: #eaf5ff;
  --color-wisteria-blue-100: #dbe8ff;
  --color-wisteria-blue-200: #c4d5f7;
  --color-wisteria-blue-300: #a4b7e0;
  --color-wisteria-blue-400: #869fcd;
  --color-wisteria-blue-500: #6a86bb;
  --color-wisteria-blue-600: #5a719e;
  --color-wisteria-blue-700: #485b7e;
  --color-wisteria-blue-800: #33435e;
  --color-wisteria-blue-900: #222e42;
  --color-wisteria-blue-950: #121b2a;
}

SCSS

$wisteria-blue: #819bcc;
$wisteria-blue-rgb: 129, 155, 204;
$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);
}