#0080C4

CSS

:root {
  --honolulu-blue: #0080c4;
  --honolulu-blue-rgb: 0 128 196;
  --honolulu-blue-oklch: oklch(0.576 0.139 243);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(201 100% 38%);
  border-color: oklch(0.576 0.139 243);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #0080c4;
  --color-honolulu-blue-50: #d5faff;
  --color-honolulu-blue-100: #c2eeff;
  --color-honolulu-blue-200: #a2dbff;
  --color-honolulu-blue-300: #77bffa;
  --color-honolulu-blue-400: #49a7ea;
  --color-honolulu-blue-500: #008eda;
  --color-honolulu-blue-600: #0278b8;
  --color-honolulu-blue-700: #066094;
  --color-honolulu-blue-800: #00476d;
  --color-honolulu-blue-900: #00314d;
  --color-honolulu-blue-950: #001d33;
}

SCSS

$honolulu-blue: #0080c4;
$honolulu-blue-rgb: 0, 128, 196;
$honolulu-blue-light: mix(#fff, $honolulu-blue, 20%);
$honolulu-blue-dark: mix(#000, $honolulu-blue, 20%);

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