#4093A7

CSS

:root {
  --blue-moon: #4093a7;
  --blue-moon-rgb: 64 147 167;
  --blue-moon-oklch: oklch(0.62 0.085 216.1);
}

.element {
  color: var(--blue-moon);
  background-color: hsl(192 45% 45%);
  border-color: oklch(0.62 0.085 216.1);
}

Tailwind CSS v4

@theme {
  --color-blue-moon: #4093a7;
  --color-blue-moon-50: #dbfcff;
  --color-blue-moon-100: #c9effb;
  --color-blue-moon-200: #acdeed;
  --color-blue-moon-300: #85c2d5;
  --color-blue-moon-400: #5fabbf;
  --color-blue-moon-500: #3394aa;
  --color-blue-moon-600: #2e7d90;
  --color-blue-moon-700: #246473;
  --color-blue-moon-800: #184a54;
  --color-blue-moon-900: #0f333b;
  --color-blue-moon-950: #021f25;
}

SCSS

$blue-moon: #4093a7;
$blue-moon-rgb: 64, 147, 167;
$blue-moon-light: mix(#fff, $blue-moon, 20%);
$blue-moon-dark: mix(#000, $blue-moon, 20%);

.element {
  color: $blue-moon;
  box-shadow: 0 0 0 2px rgba($blue-moon, 0.35);
}