#1A7DB3

CSS

:root {
  --honolulu-blue: #1a7db3;
  --honolulu-blue-rgb: 26 125 179;
  --honolulu-blue-oklch: oklch(0.562 0.119 239.4);
}

.element {
  color: var(--honolulu-blue);
  background-color: hsl(201 75% 40%);
  border-color: oklch(0.562 0.119 239.4);
}

Tailwind CSS v4

@theme {
  --color-honolulu-blue: #1a7db3;
  --color-honolulu-blue-50: #d8faff;
  --color-honolulu-blue-100: #c6eeff;
  --color-honolulu-blue-200: #a7dbff;
  --color-honolulu-blue-300: #7fbfef;
  --color-honolulu-blue-400: #54a8dd;
  --color-honolulu-blue-500: #208fcc;
  --color-honolulu-blue-600: #1f79ac;
  --color-honolulu-blue-700: #19618a;
  --color-honolulu-blue-800: #0c4866;
  --color-honolulu-blue-900: #083248;
  --color-honolulu-blue-950: #001d2f;
}

SCSS

$honolulu-blue: #1a7db3;
$honolulu-blue-rgb: 26, 125, 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);
}