#7399ED

CSS

:root {
  --wisteria-blue: #7399ed;
  --wisteria-blue-rgb: 115 153 237;
  --wisteria-blue-oklch: oklch(0.691 0.131 264.7);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(221 77% 69%);
  border-color: oklch(0.691 0.131 264.7);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #7399ed;
  --color-wisteria-blue-50: #e4f5ff;
  --color-wisteria-blue-100: #d4e8ff;
  --color-wisteria-blue-200: #bbd3ff;
  --color-wisteria-blue-300: #99b6fb;
  --color-wisteria-blue-400: #789cec;
  --color-wisteria-blue-500: #5a82dd;
  --color-wisteria-blue-600: #4d6eba;
  --color-wisteria-blue-700: #3d5896;
  --color-wisteria-blue-800: #29416f;
  --color-wisteria-blue-900: #1c2d4f;
  --color-wisteria-blue-950: #0c1934;
}

SCSS

$wisteria-blue: #7399ed;
$wisteria-blue-rgb: 115, 153, 237;
$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);
}