#005A9A

CSS

:root {
  --hyper-blue: #005a9a;
  --hyper-blue-rgb: 0 90 154;
  --hyper-blue-oklch: oklch(0.458 0.126 249);
}

.element {
  color: var(--hyper-blue);
  background-color: hsl(205 100% 30%);
  border-color: oklch(0.458 0.126 249);
}

Tailwind CSS v4

@theme {
  --color-hyper-blue: #005a9a;
  --color-hyper-blue-50: #dbf9ff;
  --color-hyper-blue-100: #c9ecff;
  --color-hyper-blue-200: #acd9ff;
  --color-hyper-blue-300: #86bcf6;
  --color-hyper-blue-400: #5fa4e6;
  --color-hyper-blue-500: #368bd5;
  --color-hyper-blue-600: #3075b4;
  --color-hyper-blue-700: #265e91;
  --color-hyper-blue-800: #17456b;
  --color-hyper-blue-900: #0f304c;
  --color-hyper-blue-950: #021c32;
}

SCSS

$hyper-blue: #005a9a;
$hyper-blue-rgb: 0, 90, 154;
$hyper-blue-light: mix(#fff, $hyper-blue, 20%);
$hyper-blue-dark: mix(#000, $hyper-blue, 20%);

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