#799BD7

CSS

:root {
  --wisteria-blue: #799bd7;
  --wisteria-blue-rgb: 121 155 215;
  --wisteria-blue-oklch: oklch(0.688 0.097 261.4);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(218 54% 66%);
  border-color: oklch(0.688 0.097 261.4);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #799bd7;
  --color-wisteria-blue-50: #e7f6ff;
  --color-wisteria-blue-100: #d7e8ff;
  --color-wisteria-blue-200: #bfd5ff;
  --color-wisteria-blue-300: #9eb8ea;
  --color-wisteria-blue-400: #7e9fd8;
  --color-wisteria-blue-500: #6286c6;
  --color-wisteria-blue-600: #5371a7;
  --color-wisteria-blue-700: #425b86;
  --color-wisteria-blue-800: #2e4364;
  --color-wisteria-blue-900: #1f2e46;
  --color-wisteria-blue-950: #0f1b2e;
}

SCSS

$wisteria-blue: #799bd7;
$wisteria-blue-rgb: 121, 155, 215;
$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);
}