#1B609C

CSS

:root {
  --hyper-blue: #1b609c;
  --hyper-blue-rgb: 27 96 156;
  --hyper-blue-oklch: oklch(0.479 0.117 249.5);
}

.element {
  color: var(--hyper-blue);
  background-color: hsl(208 70% 36%);
  border-color: oklch(0.479 0.117 249.5);
}

Tailwind CSS v4

@theme {
  --color-hyper-blue: #1b609c;
  --color-hyper-blue-50: #ddf8ff;
  --color-hyper-blue-100: #ccebff;
  --color-hyper-blue-200: #b0d8ff;
  --color-hyper-blue-300: #8abcf2;
  --color-hyper-blue-400: #65a3e1;
  --color-hyper-blue-500: #408ad0;
  --color-hyper-blue-600: #3875b0;
  --color-hyper-blue-700: #2c5e8d;
  --color-hyper-blue-800: #1c4569;
  --color-hyper-blue-900: #12304a;
  --color-hyper-blue-950: #041c30;
}

SCSS

$hyper-blue: #1b609c;
$hyper-blue-rgb: 27, 96, 156;
$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);
}