#257BAF

CSS

:root {
  --honolulu-blue: #257baf;
  --honolulu-blue-rgb: 37 123 175;
  --honolulu-blue-oklch: oklch(0.557 0.113 240.4);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(203 65% 42%);
  border-color: oklch(0.557 0.113 240.4);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #257baf;
  --color-honolulu-blue-50: #dafaff;
  --color-honolulu-blue-100: #c8edff;
  --color-honolulu-blue-200: #aadbff;
  --color-honolulu-blue-300: #83bfed;
  --color-honolulu-blue-400: #5ba7db;
  --color-honolulu-blue-500: #2e8ec9;
  --color-honolulu-blue-600: #2979aa;
  --color-honolulu-blue-700: #216188;
  --color-honolulu-blue-800: #134765;
  --color-honolulu-blue-900: #0c3147;
  --color-honolulu-blue-950: #011d2e;
}

SCSS

$honolulu-blue: #257baf;
$honolulu-blue-rgb: 37, 123, 175;
$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);
}