#157BB2

CSS

:root {
  --honolulu-blue: #157bb2;
  --honolulu-blue-rgb: 21 123 178;
  --honolulu-blue-oklch: oklch(0.556 0.12 239.8);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(201 79% 39%);
  border-color: oklch(0.556 0.12 239.8);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #157bb2;
  --color-honolulu-blue-50: #d8faff;
  --color-honolulu-blue-100: #c5eeff;
  --color-honolulu-blue-200: #a7dbff;
  --color-honolulu-blue-300: #7ebff0;
  --color-honolulu-blue-400: #53a7de;
  --color-honolulu-blue-500: #1e8fcd;
  --color-honolulu-blue-600: #1e79ad;
  --color-honolulu-blue-700: #18618b;
  --color-honolulu-blue-800: #0b4867;
  --color-honolulu-blue-900: #073248;
  --color-honolulu-blue-950: #001d2f;
}

SCSS

$honolulu-blue: #157bb2;
$honolulu-blue-rgb: 21, 123, 178;
$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);
}