#037DB9

CSS

:root {
  --honolulu-blue: #037db9;
  --honolulu-blue-rgb: 3 125 185;
  --honolulu-blue-oklch: oklch(0.563 0.129 240.4);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(200 97% 37%);
  border-color: oklch(0.563 0.129 240.4);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #037db9;
  --color-honolulu-blue-50: #d6fbff;
  --color-honolulu-blue-100: #c3eeff;
  --color-honolulu-blue-200: #a4dcff;
  --color-honolulu-blue-300: #7abff4;
  --color-honolulu-blue-400: #4da7e3;
  --color-honolulu-blue-500: #058fd2;
  --color-honolulu-blue-600: #0f79b2;
  --color-honolulu-blue-700: #0e618f;
  --color-honolulu-blue-800: #02486a;
  --color-honolulu-blue-900: #03324a;
  --color-honolulu-blue-950: #001d31;
}

SCSS

$honolulu-blue: #037db9;
$honolulu-blue-rgb: 3, 125, 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);
}