Jazzy Blue

CSS

:root {
  --jazzy-blue: #3a4c88;
  --jazzy-blue-rgb: 58 76 136;
  --jazzy-blue-oklch: oklch(0.432 0.102 269.3);
}

.element {
  color: var(--jazzy-blue);
  background-color: hsl(226 40% 38%);
  border-color: oklch(0.432 0.102 269.3);
}

Tailwind CSS v4

@theme {
  --color-jazzy-blue: #3a4c88;
  --color-jazzy-blue-50: #eaf4ff;
  --color-jazzy-blue-100: #dbe7ff;
  --color-jazzy-blue-200: #c4d3ff;
  --color-jazzy-blue-300: #a4b5ec;
  --color-jazzy-blue-400: #869cdb;
  --color-jazzy-blue-500: #6b82ca;
  --color-jazzy-blue-600: #5b6eaa;
  --color-jazzy-blue-700: #485889;
  --color-jazzy-blue-800: #334166;
  --color-jazzy-blue-900: #222d47;
  --color-jazzy-blue-950: #121a2f;
}

SCSS

$jazzy-blue: #3a4c88;
$jazzy-blue-rgb: 58, 76, 136;
$jazzy-blue-light: mix(#fff, $jazzy-blue, 20%);
$jazzy-blue-dark: mix(#000, $jazzy-blue, 20%);

.element {
  color: $jazzy-blue;
  box-shadow: 0 0 0 2px rgba($jazzy-blue, 0.35);
}