#157BB6

CSS

:root {
  --honolulu-blue: #157bb6;
  --honolulu-blue-rgb: 21 123 182;
  --honolulu-blue-oklch: oklch(0.558 0.125 241.6);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(202 79% 40%);
  border-color: oklch(0.558 0.125 241.6);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #157bb6;
  --color-honolulu-blue-50: #d8faff;
  --color-honolulu-blue-100: #c5eeff;
  --color-honolulu-blue-200: #a6dbff;
  --color-honolulu-blue-300: #7ebff3;
  --color-honolulu-blue-400: #53a7e1;
  --color-honolulu-blue-500: #1d8ed1;
  --color-honolulu-blue-600: #1d78b0;
  --color-honolulu-blue-700: #17608e;
  --color-honolulu-blue-800: #0a4769;
  --color-honolulu-blue-900: #07314a;
  --color-honolulu-blue-950: #001d30;
}

SCSS

$honolulu-blue: #157bb6;
$honolulu-blue-rgb: 21, 123, 182;
$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);
}