#1D7BB3

CSS

:root {
  --honolulu-blue: #1d7bb3;
  --honolulu-blue-rgb: 29 123 179;
  --honolulu-blue-oklch: oklch(0.558 0.12 241.2);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(202 72% 41%);
  border-color: oklch(0.558 0.12 241.2);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #1d7bb3;
  --color-honolulu-blue-50: #d9faff;
  --color-honolulu-blue-100: #c6edff;
  --color-honolulu-blue-200: #a8dbff;
  --color-honolulu-blue-300: #80bff0;
  --color-honolulu-blue-400: #56a7de;
  --color-honolulu-blue-500: #258ece;
  --color-honolulu-blue-600: #2379ad;
  --color-honolulu-blue-700: #1c608b;
  --color-honolulu-blue-800: #0e4767;
  --color-honolulu-blue-900: #093148;
  --color-honolulu-blue-950: #001d2f;
}

SCSS

$honolulu-blue: #1d7bb3;
$honolulu-blue-rgb: 29, 123, 179;
$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);
}