#739AE9

CSS

:root {
  --wisteria-blue: #739ae9;
  --wisteria-blue-rgb: 115 154 233;
  --wisteria-blue-oklch: oklch(0.691 0.125 263.5);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(220 73% 68%);
  border-color: oklch(0.691 0.125 263.5);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #739ae9;
  --color-wisteria-blue-50: #e4f5ff;
  --color-wisteria-blue-100: #d4e8ff;
  --color-wisteria-blue-200: #bbd4ff;
  --color-wisteria-blue-300: #99b6f8;
  --color-wisteria-blue-400: #789de8;
  --color-wisteria-blue-500: #5a83d8;
  --color-wisteria-blue-600: #4d6fb6;
  --color-wisteria-blue-700: #3d5993;
  --color-wisteria-blue-800: #29416d;
  --color-wisteria-blue-900: #1c2d4d;
  --color-wisteria-blue-950: #0c1a33;
}

SCSS

$wisteria-blue: #739ae9;
$wisteria-blue-rgb: 115, 154, 233;
$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);
}