#789CD4

CSS

:root {
  --wisteria-blue: #789cd4;
  --wisteria-blue-rgb: 120 156 212;
  --wisteria-blue-oklch: oklch(0.688 0.092 259);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(217 52% 65%);
  border-color: oklch(0.688 0.092 259);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #789cd4;
  --color-wisteria-blue-50: #e7f6ff;
  --color-wisteria-blue-100: #d7e9ff;
  --color-wisteria-blue-200: #bed5fd;
  --color-wisteria-blue-300: #9db8e7;
  --color-wisteria-blue-400: #7da0d5;
  --color-wisteria-blue-500: #6087c3;
  --color-wisteria-blue-600: #5272a5;
  --color-wisteria-blue-700: #415b84;
  --color-wisteria-blue-800: #2d4362;
  --color-wisteria-blue-900: #1f2e45;
  --color-wisteria-blue-950: #0e1b2d;
}

SCSS

$wisteria-blue: #789cd4;
$wisteria-blue-rgb: 120, 156, 212;
$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);
}