#7B99E2

CSS

:root {
  --wisteria-blue: #7b99e2;
  --wisteria-blue-rgb: 123 153 226;
  --wisteria-blue-oklch: oklch(0.69 0.113 266.5);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(223 64% 68%);
  border-color: oklch(0.69 0.113 266.5);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #7b99e2;
  --color-wisteria-blue-50: #e7f5ff;
  --color-wisteria-blue-100: #d8e7ff;
  --color-wisteria-blue-200: #c0d3ff;
  --color-wisteria-blue-300: #9fb6f2;
  --color-wisteria-blue-400: #809ce2;
  --color-wisteria-blue-500: #6383d1;
  --color-wisteria-blue-600: #546fb0;
  --color-wisteria-blue-700: #43588e;
  --color-wisteria-blue-800: #2e416a;
  --color-wisteria-blue-900: #1f2d4a;
  --color-wisteria-blue-950: #0f1a31;
}

SCSS

$wisteria-blue: #7b99e2;
$wisteria-blue-rgb: 123, 153, 226;
$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);
}