#177BB1

CSS

:root {
  --honolulu-blue: #177bb1;
  --honolulu-blue-rgb: 23 123 177;
  --honolulu-blue-oklch: oklch(0.556 0.119 239.5);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(201 77% 39%);
  border-color: oklch(0.556 0.119 239.5);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #177bb1;
  --color-honolulu-blue-50: #d8faff;
  --color-honolulu-blue-100: #c6eeff;
  --color-honolulu-blue-200: #a7dbff;
  --color-honolulu-blue-300: #7fbfef;
  --color-honolulu-blue-400: #54a7dd;
  --color-honolulu-blue-500: #208fcc;
  --color-honolulu-blue-600: #1f79ac;
  --color-honolulu-blue-700: #19618a;
  --color-honolulu-blue-800: #0c4866;
  --color-honolulu-blue-900: #083248;
  --color-honolulu-blue-950: #001d2f;
}

SCSS

$honolulu-blue: #177bb1;
$honolulu-blue-rgb: 23, 123, 177;
$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);
}