#4149C8

CSS

:root {
  --flying-fish-blue: #4149c8;
  --flying-fish-blue-rgb: 65 73 200;
  --flying-fish-blue-oklch: oklch(0.48 0.194 273.7);
}

.element {
  color: var(--flying-fish-blue);
  background-color: hsl(236 55% 52%);
  border-color: oklch(0.48 0.194 273.7);
}

Tailwind CSS v4

@theme {
  --color-flying-fish-blue: #4149c8;
  --color-flying-fish-blue-50: #e5f1ff;
  --color-flying-fish-blue-100: #d5e3ff;
  --color-flying-fish-blue-200: #bdcdff;
  --color-flying-fish-blue-300: #9dadff;
  --color-flying-fish-blue-400: #7c91ff;
  --color-flying-fish-blue-500: #6272ff;
  --color-flying-fish-blue-600: #5361db;
  --color-flying-fish-blue-700: #424eb0;
  --color-flying-fish-blue-800: #2c3984;
  --color-flying-fish-blue-900: #1e275e;
  --color-flying-fish-blue-950: #0e1440;
}

SCSS

$flying-fish-blue: #4149c8;
$flying-fish-blue-rgb: 65, 73, 200;
$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);
}