#19077B

CSS

:root {
  --insomniac-blue: #19077b;
  --insomniac-blue-rgb: 25 7 123;
  --insomniac-blue-oklch: oklch(0.282 0.171 273.2);
}

.element {
  color: var(--insomniac-blue);
  background-color: hsl(249 89% 25%);
  border-color: oklch(0.282 0.171 273.2);
}

Tailwind CSS v4

@theme {
  --color-insomniac-blue: #19077b;
  --color-insomniac-blue-50: #e6f2ff;
  --color-insomniac-blue-100: #d7e4ff;
  --color-insomniac-blue-200: #bfcfff;
  --color-insomniac-blue-300: #9eafff;
  --color-insomniac-blue-400: #7e94ff;
  --color-insomniac-blue-500: #6477f5;
  --color-insomniac-blue-600: #5565cf;
  --color-insomniac-blue-700: #4351a6;
  --color-insomniac-blue-800: #2e3c7d;
  --color-insomniac-blue-900: #1f2958;
  --color-insomniac-blue-950: #0f163c;
}

SCSS

$insomniac-blue: #19077b;
$insomniac-blue-rgb: 25, 7, 123;
$insomniac-blue-light: mix(#fff, $insomniac-blue, 20%);
$insomniac-blue-dark: mix(#000, $insomniac-blue, 20%);

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