#1E7CB7

CSS

:root {
  --honolulu-blue: #1e7cb7;
  --honolulu-blue-rgb: 30 124 183;
  --honolulu-blue-oklch: oklch(0.563 0.123 242.4);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(203 72% 42%);
  border-color: oklch(0.563 0.123 242.4);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #1e7cb7;
  --color-honolulu-blue-50: #d8faff;
  --color-honolulu-blue-100: #c6edff;
  --color-honolulu-blue-200: #a8dbff;
  --color-honolulu-blue-300: #80bef2;
  --color-honolulu-blue-400: #56a6e1;
  --color-honolulu-blue-500: #248ed0;
  --color-honolulu-blue-600: #2278b0;
  --color-honolulu-blue-700: #1b608d;
  --color-honolulu-blue-800: #0d4768;
  --color-honolulu-blue-900: #093149;
  --color-honolulu-blue-950: #001d30;
}

SCSS

$honolulu-blue: #1e7cb7;
$honolulu-blue-rgb: 30, 124, 183;
$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);
}