#177CB9

CSS

:root {
  --honolulu-blue: #177cb9;
  --honolulu-blue-rgb: 23 124 185;
  --honolulu-blue-oklch: oklch(0.563 0.127 242.5);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(203 78% 41%);
  border-color: oklch(0.563 0.127 242.5);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #177cb9;
  --color-honolulu-blue-50: #d7faff;
  --color-honolulu-blue-100: #c5edff;
  --color-honolulu-blue-200: #a6dbff;
  --color-honolulu-blue-300: #7ebff4;
  --color-honolulu-blue-400: #52a7e3;
  --color-honolulu-blue-500: #1c8ed3;
  --color-honolulu-blue-600: #1c78b2;
  --color-honolulu-blue-700: #17608f;
  --color-honolulu-blue-800: #09476a;
  --color-honolulu-blue-900: #06314a;
  --color-honolulu-blue-950: #001d31;
}

SCSS

$honolulu-blue: #177cb9;
$honolulu-blue-rgb: 23, 124, 185;
$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);
}