#005D9E

CSS

:root {
  --hyper-blue: #005d9e;
  --hyper-blue-rgb: 0 93 158;
  --hyper-blue-oklch: oklch(0.468 0.128 248.7);
}

.element {
  color: var(--hyper-blue);
  background-color: hsl(205 100% 31%);
  border-color: oklch(0.468 0.128 248.7);
}

Tailwind CSS v4

@theme {
  --color-hyper-blue: #005d9e;
  --color-hyper-blue-50: #dbf9ff;
  --color-hyper-blue-100: #c9ecff;
  --color-hyper-blue-200: #abd9ff;
  --color-hyper-blue-300: #85bcf7;
  --color-hyper-blue-400: #5da4e7;
  --color-hyper-blue-500: #348bd6;
  --color-hyper-blue-600: #2e75b5;
  --color-hyper-blue-700: #245e91;
  --color-hyper-blue-800: #15456c;
  --color-hyper-blue-900: #0d304c;
  --color-hyper-blue-950: #021c32;
}

SCSS

$hyper-blue: #005d9e;
$hyper-blue-rgb: 0, 93, 158;
$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);
}