#7B9BD4

CSS

:root {
  --wisteria-blue: #7b9bd4;
  --wisteria-blue-rgb: 123 155 212;
  --wisteria-blue-oklch: oklch(0.688 0.092 261.6);
}

.element {
  color: var(--wisteria-blue);
  background-color: hsl(218 51% 66%);
  border-color: oklch(0.688 0.092 261.6);
}

Tailwind CSS v4

@theme {
  --color-wisteria-blue: #7b9bd4;
  --color-wisteria-blue-50: #e8f6ff;
  --color-wisteria-blue-100: #d8e8ff;
  --color-wisteria-blue-200: #c0d5fd;
  --color-wisteria-blue-300: #9fb8e7;
  --color-wisteria-blue-400: #809fd5;
  --color-wisteria-blue-500: #6486c3;
  --color-wisteria-blue-600: #5571a5;
  --color-wisteria-blue-700: #445b84;
  --color-wisteria-blue-800: #2f4362;
  --color-wisteria-blue-900: #202e45;
  --color-wisteria-blue-950: #0f1b2d;
}

SCSS

$wisteria-blue: #7b9bd4;
$wisteria-blue-rgb: 123, 155, 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);
}