#267CB4

CSS

:root {
  --honolulu-blue: #267cb4;
  --honolulu-blue-rgb: 38 124 180;
  --honolulu-blue-oklch: oklch(0.563 0.117 242.3);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(204 65% 43%);
  border-color: oklch(0.563 0.117 242.3);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #267cb4;
  --color-honolulu-blue-50: #dafaff;
  --color-honolulu-blue-100: #c8edff;
  --color-honolulu-blue-200: #aadaff;
  --color-honolulu-blue-300: #82bef0;
  --color-honolulu-blue-400: #5aa6de;
  --color-honolulu-blue-500: #2d8ecd;
  --color-honolulu-blue-600: #2978ad;
  --color-honolulu-blue-700: #20608b;
  --color-honolulu-blue-800: #124767;
  --color-honolulu-blue-900: #0c3148;
  --color-honolulu-blue-950: #001d2f;
}

SCSS

$honolulu-blue: #267cb4;
$honolulu-blue-rgb: 38, 124, 180;
$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);
}