#237DB1

CSS

:root {
  --honolulu-blue: #237db1;
  --honolulu-blue-rgb: 35 125 177;
  --honolulu-blue-oklch: oklch(0.563 0.114 239.6);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(202 67% 42%);
  border-color: oklch(0.563 0.114 239.6);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #237db1;
  --color-honolulu-blue-50: #d9faff;
  --color-honolulu-blue-100: #c7eeff;
  --color-honolulu-blue-200: #a9dbff;
  --color-honolulu-blue-300: #81bfed;
  --color-honolulu-blue-400: #59a7db;
  --color-honolulu-blue-500: #2a8fc9;
  --color-honolulu-blue-600: #2679aa;
  --color-honolulu-blue-700: #1e6189;
  --color-honolulu-blue-800: #114765;
  --color-honolulu-blue-900: #0b3247;
  --color-honolulu-blue-950: #001d2e;
}

SCSS

$honolulu-blue: #237db1;
$honolulu-blue-rgb: 35, 125, 177;
$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);
}