#2448CE

CSS

:root {
  --flying-fish-blue: #2448ce;
  --flying-fish-blue-rgb: 36 72 206;
  --flying-fish-blue-oklch: oklch(0.47 0.21 266.2);
}

.element {
  color: var(--flying-fish-blue);
  background-color: hsl(227 70% 47%);
  border-color: oklch(0.47 0.21 266.2);
}

Tailwind CSS v4

@theme {
  --color-flying-fish-blue: #2448ce;
  --color-flying-fish-blue-50: #dbf4ff;
  --color-flying-fish-blue-100: #cae6ff;
  --color-flying-fish-blue-200: #aed0ff;
  --color-flying-fish-blue-300: #8ab1ff;
  --color-flying-fish-blue-400: #6495ff;
  --color-flying-fish-blue-500: #4576ff;
  --color-flying-fish-blue-600: #3b64e4;
  --color-flying-fish-blue-700: #2e50b7;
  --color-flying-fish-blue-800: #1b3b8a;
  --color-flying-fish-blue-900: #112961;
  --color-flying-fish-blue-950: #051543;
}

SCSS

$flying-fish-blue: #2448ce;
$flying-fish-blue-rgb: 36, 72, 206;
$flying-fish-blue-light: mix(#fff, $flying-fish-blue, 20%);
$flying-fish-blue-dark: mix(#000, $flying-fish-blue, 20%);

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