#4E7B9E

CSS

:root {
  --zenith: #4e7b9e;
  --zenith-rgb: 78 123 158;
  --zenith-oklch: oklch(0.565 0.074 243);
}

.element {
  color: var(--zenith);
  background-color: hsl(206 34% 46%);
  border-color: oklch(0.565 0.074 243);
}

Tailwind CSS v4

@theme {
  --color-zenith: #4e7b9e;
  --color-zenith-50: #e4f8ff;
  --color-zenith-100: #d4ebff;
  --color-zenith-200: #bbd8f2;
  --color-zenith-300: #98bcdb;
  --color-zenith-400: #78a4c7;
  --color-zenith-500: #598cb3;
  --color-zenith-600: #4c7697;
  --color-zenith-700: #3d5f79;
  --color-zenith-800: #2a465a;
  --color-zenith-900: #1c303f;
  --color-zenith-950: #0c1c28;
}

SCSS

$zenith: #4e7b9e;
$zenith-rgb: 78, 123, 158;
$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);
}