#527B9B

CSS

:root {
  --zenith: #527b9b;
  --zenith-rgb: 82 123 155;
  --zenith-oklch: oklch(0.566 0.068 242.9);
}

.element {
  color: var(--zenith);
  background-color: hsl(206 31% 46%);
  border-color: oklch(0.566 0.068 242.9);
}

Tailwind CSS v4

@theme {
  --color-zenith: #527b9b;
  --color-zenith-50: #e6f8ff;
  --color-zenith-100: #d6ebfe;
  --color-zenith-200: #bdd8f0;
  --color-zenith-300: #9bbcd8;
  --color-zenith-400: #7ca4c4;
  --color-zenith-500: #5d8cb0;
  --color-zenith-600: #507694;
  --color-zenith-700: #3f5f77;
  --color-zenith-800: #2c4658;
  --color-zenith-900: #1e303d;
  --color-zenith-950: #0e1c27;
}

SCSS

$zenith: #527b9b;
$zenith-rgb: 82, 123, 155;
$zenith-light: mix(#fff, $zenith, 20%);
$zenith-dark: mix(#000, $zenith, 20%);

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